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Circuit Breakers (Low Capacity)（Ampere frame：100AF to 199AF）
Configure
Specification/Dimensions
-
Ampere frame
- 30AF or less
- 32AF
- 50AF
- 60AF
- 63AF
- 100AF to 199AF
- 200AF to 399AF
- 400AF or higher
-
Rated block capacity AC 100 V(kA)
-
Rated block capacity AC 200 V(kA)
-
Rated block capacity AC 400 V(kA)
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Rated Braking Capacity at Rated Voltage of VDC 250(kA)
- 2.5
- 7.5
- 15
- 20
- 40
- 50
- 230
- AC 230 / 400
- AC 415 / DC 125
- AC 550
- AC 550 / DC 250
- AC 690
- AC 690 / DC 500
- acc. to IEC 60898-1 230 V AC
-
acc. to IEC 60898-1 230 / 400 V AC
acc. to IEC 60898-1 230 V
acc. to IEC 60947-2 230 V AC -
acc. to IEC 60898-1 230 V AC
acc. to IEC 60947-2 230 V AC -
acc. to IEC 60898-1 230 V AC
acc. to IEC 60947-2 240 V AC -
acc. to IEC 60898-1 230 V AC
acc. to IEC 60947-2 400 V AC - acc. to IEC 60898-1 240 V
-
acc. to IEC 60898-1 240 V AC
acc. to IEC 60898-1 240 V
acc. to IEC 60947-2 240 V AC -
acc. to IEC 60898-1 400 V AC
acc. to IEC 60898-1 400 V
acc. to IEC 60947-2 400 V AC -
acc. to IEC 60898-1 400 V AC
acc. to IEC 60898-1 400 V
acc. to IEC 60947-2 440 V AC -
acc. to IEC 60898-1 400 V AC
acc. to IEC 60947-2 400 V AC -
acc. to IEC 60898-1 400 V AC
acc. to IEC 60947-2 415 V AC -
acc. to IEC 60898-1 400 V AC
acc. to IEC 60947-2 690 V AC -
acc. to IEC 60898-1 400 V AC
acc. to IEC 60947-2 690 V AC - (acc. to IEC 60898-1) 415
-
acc. to IEC 60898-1 415 V AC
acc. to IEC 60898-1 415 V
acc. to IEC 60947-2 415 V AC - acc. to IEC 60947-2 240 V
- -
-
Rated block capacity, voltages except VAC 100/200/400, VDC 250
- Available
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Number of Poles
- 1
- 2
- 3
- 4
-
Rated Current(A)
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Mounting Method
-
Connection Method
- Surface type
- Backside shape
- Embedded Type
- Insert shape
- Insert shape
-
Representative Standard
-
Dimension height(mm)
-
Dimension width(mm)
-
Dimension depth(mm)
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You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-SV Series
MITSUBISHI
WS-V series NF-S type no-fuse breaker (general-purpose product).
[Features]
· Small, high performance, and economical no-fuse breaker.
· Connection method: front surface type, back surface type, embedded type, inserted type.
[Applications]
· No-fuse breaker, general-purpose product.From: ฿ 2,570.00 Special Price Days to Ship: 
Same day
Same day
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-CV/SV
MITSUBISHI
WS-V series no-fuse breaker for motor protection.From: ฿ 2,812.00 Special Price Days to Ship:
Same day
Same day
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-CS Series with accessories
MITSUBISHI
Mitsubishi low-voltage breaker contributing to building the future of electrical equipment.
Mitsubishi No-Fuse Breakers and Earth Leakage Circuit Breakers, meeting the needs of the market for over half a century.
Including the new WS-V series equipped with the latest breaker technology, various product ranges are available that address the needs of both the power incoming panel / distribution board market and machinery market.From: ฿ 1,968.00 Special Price Days to Ship:
Same day
Same day
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-SVF Series with accessories
MITSUBISHI
Mitsubishi low-voltage breaker contributing to building the future of electrical equipment.
Mitsubishi No-Fuse Breakers and Earth Leakage Circuit Breakers, meeting the needs of the market for over half a century.
Including the new WS-V series equipped with the latest breaker technology, various product ranges are available that address the needs of both the power incoming panel / distribution board market and machinery market.From: ฿ 10,402.00 Special Price Days to Ship:
72 Day(s)
72 Day(s)
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-SVFU Series with accessories
MITSUBISHI
Mitsubishi low-voltage breaker contributing to building the future of electrical equipment.
Mitsubishi No-Fuse Breakers and Earth Leakage Circuit Breakers, meeting the needs of the market for over half a century.
Including the new WS-V series equipped with the latest breaker technology, various product ranges are available that address the needs of both the power incoming panel / distribution board market and machinery market.From: ฿ 9,868.00 Special Price Days to Ship:
72 Day(s)
72 Day(s)
-
You can add up to 6 items per a category to the compare list.
Schneider Electric
EasyPact CVS range is the easy choice for quality and value.
Designed to meet the requirements of the majority of common protection applications in small to medium-sized buildings, EasyPact CVS circuit breakers deliver a high level of performance and cost-saving functionality that is unusual in their price range.
- Rated current from 16 to 630 A
- Breaking capacity from 25 to 50 kA at 400/415 V
- 3 and 4 pole versions
- 3 frame sizes
- Thermal-magnetic and electronic protection available for the entire range
- Extended, adjustable thermal protection from 0.7 to 1 times (TMD) or 0.5 to 1 times (electronic) the rating of the trip unit
- Common accessories and auxiliaries with other Schneider Electric MCCB offers
- Suitable for isolation
- Earth-leakage protection by associated Vigi Module
- Switch-disconnector versions also available
- Compliance with international standards: IEC 60947-2, CCC, EAC and other local certifications
- Green Premium productFrom: ฿ 2,050.31 Days to Ship:
Same day
Same day
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-SV Series with accessories
MITSUBISHI
Mitsubishi low-voltage breaker contributing to building the future of electrical equipment.
Mitsubishi No-Fuse Breakers and Earth Leakage Circuit Breakers, meeting the needs of the market for over half a century.
Including the new WS-V series equipped with the latest breaker technology, various product ranges are available that address the needs of both the power incoming panel / distribution board market and machinery market.From: ฿ 5,372.00 Special Price Days to Ship:
72 Day(s)
72 Day(s)
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-HRV Series
MITSUBISHI
- MCCB (Molded Case Circuit Breakers) High performance class NF-HRV series from Mitsubishi electric. - Frame size is 50. - No. of pole can be select 2 or 3 poles. - Applicable for both AC/DC. - Rated ambient temperature 40°C. - Rated current can be select up to 50 A. - Rated insulation voltage (Ui) is 690 V - Mechanical duration (On/Off) is up to 25,000 times. - Electrical duration (On/Off) is up to 10,000 times. - Possible to reverse connection.From: ฿ 4,217.00 Special Price Days to Ship:
72 Day(s)
72 Day(s)
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025WS-V Series NF-KC, MCCB for Power Distribution Board / Control Panel
MITSUBISHI
[Features]
・ It is suitable for power distribution board applications due to the agreement type dimensions for lamp power distribution boards, and also suitable for control panel applications due to IEC 35 mm rail standard support
・ No need for branch conductors, reducing the width of the board and the number of partsFrom: ฿ 4,640.00 Special Price Days to Ship:
Same day
Same day
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-HCW Series with accessories
MITSUBISHI
Mitsubishi low-voltage breaker contributing to building the future of electrical equipment.
Mitsubishi No-Fuse Breakers and Earth Leakage Circuit Breakers, meeting the needs of the market for over half a century.
Including the new WS-V series equipped with the latest breaker technology, various product ranges are available that address the needs of both the power incoming panel / distribution board market and machinery market.From: ฿ 9,197.00 Special Price Days to Ship:
72 Day(s)
72 Day(s)
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-S Series
MITSUBISHI
- Low-Voltage Circuit Breakers MCCB (Molded Case Circuit Breakers) NF-S series from Mitsubishi electric. - The molded case circuit breaker (MCCB) opens and closes a low voltage circuit and breaks the fault current (an overload current or short circuit current) automatically, to protect the wirings/conductors of the circuit. - MCCB (Molded Case Circuit Breakers) NF-S series is standard class type of circuit breaker. - Rated ambient temperature 40°C. - Number of poles is up to 4. - Rated current can be select up to 1,600 A.From: ฿ 7,350.00 Special Price Days to Ship:
72 Day(s)
72 Day(s)
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025High Cut-off Current, No-Fuse Breakers
MISUMI
It is a no-fuse breaker with a rated breaking capacity of 35 kA. You can easily install accessories with screws.From: ฿ 1,769.03 Special Price Days to Ship:
3 Day(s)
3 Day(s)
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025UL 489 Listed MCCB, UL Compliant Product
MITSUBISHI
- Low-Voltage Circuit Breakers MCCB (Molded Case Circuit Breakers) NF series from Mitsubishi electric. - The molded case circuit breaker (MCCB) opens and closes a low voltage circuit and breaks the fault current (an overload current or short circuit current) automatically, to protect the wirings/conductors of the circuit. - MCCB (Molded Case Circuit Breakers) NF series have 4 types available, NF-C (Economy type), NF-S (Standard type), NF-H (High-performance type) and NF-U (Current limiting-type ultra-breaker). - Rated ambient temperature 40°C. - Number of poles is up to 4. - Rated current can be select up to 440 A.From: ฿ 14,338.00 Special Price Days to Ship:
72 Day(s)
72 Day(s)
-
You can add up to 6 items per a category to the compare list.
![ABS [N]□□C series (high breaking capacity type, without fuse) [ABS52C]](//th.misumi-ec.com/en/linked/material/el/LSI1/PHOTO/LSI1_75.jpg?$product_view_b$)
ABS [N]□□C series (high breaking capacity type, without fuse) [ABS52C]
LSIS
[Features]
· PSE-corresponding high reliability no fuse breaker.
· The rated cutoff capacity is as high as 35kA providing great relief.
· Rated current 15A to 100A enriches our lineup.
· Easy attachment of auxiliary equipment.
· It is a product compatible with CE marking through certification testing.From: ฿ 1,812.10 Days to Ship:
3 Day(s)
3 Day(s)
-
You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025Molded Case Circuit Breakers (MCCB) NF-FHU Series
MITSUBISHI
Mitsubishi low-voltage breaker contributing to building the future of electrical equipment.
Mitsubishi No-Fuse Breakers and Earth Leakage Circuit Breakers, meeting the needs of the market for over half a century.
Including the new WS-V series equipped with the latest breaker technology, various product ranges are available that address the needs of both the power incoming panel / distribution board market and machinery market.From: ฿ 5,397.00 Special Price Days to Ship:
72 Day(s)
72 Day(s)
-
You can add up to 6 items per a category to the compare list.
![ABS series (distribution panel-type, no fuse) [ABS32FB]](//th.misumi-ec.com/en/linked/material/el/LSI1/PHOTO/222000491785_002.jpg?$product_view_b$)
ABS series (distribution panel-type, no fuse) [ABS32FB]
LSIS
[Features]
· No fuse breaker for distribution boards that is compact and space-saving.
· The distribution board type is compact and can be used for distribution boards.
· Substantial lineup of rated current from 3A to 100A.
· Height 96 mm, depth 60 mm, JIS agreement size.
· Easy attachment of auxiliary equipment.
· Passed testing, CE mark certified product.
· Types with a breaking capacity of 5kA or 10kA are available.
· 400V power supplies can also be used.From: ฿ 977.26 Days to Ship:
3 Day(s)
3 Day(s)
-
You can add up to 6 items per a category to the compare list.
NE circuit breaker (economy type) E series surface type
NITTO KOGYO
- NE circuit breaker (economy type) E series surface type from Nitto Kogyo - A breaker that automatically cuts off the electric path and protects wiring from damage when over current and short-circuits occur. - 9 frame sizes available. (50AF, 60AF, 100AF, 150AF, 225AF, 250AF, 400AF, 600AF and 800AF) - Connecting circuit by screw type terminal block. - Maximum rated insulation voltage: 690VAC / 250VDC - Applicable crimp terminal: R2-5～CB22-5S for 50AF, R2-6～CB22-6S (22-S6) for 60AF, R5.5-8～CB60-8 (8S) for 100AF, R22-8～CB60-8 (8S) for 150AF, R22-8～CB150-8 (8S) for 150AF and 250AF, R60-12～CB325-12 (12S) for 400AF, R100-12～CB325-12 (12S) for 600AF and 800AFFrom: ฿ 4,600.03 Days to Ship:
5 Day(s)
5 Day(s)
-
You can add up to 6 items per a category to the compare list.
NBE circuit breaker (economy type) E series recessed type
NITTO KOGYO
It is an embedded type circuit breaker.From: ฿ 7,357.41 Days to Ship:
9 Day(s)
9 Day(s)
-
You can add up to 6 items per a category to the compare list.
NBE, circuit breaker (economic form), E series, rear surface shape
NITTO KOGYO
It is a surface type circuit breaker.From: ฿ 6,111.72 Days to Ship:
9 Day(s)
9 Day(s)
-
You can add up to 6 items per a category to the compare list.
NE-S, circuit breaker (generic form), S series, front surface shape
NITTO KOGYO
It is a surface type circuit breaker.From: ฿ 7,115.53 Days to Ship:
9 Day(s)
9 Day(s)
![ABS [N]□□C series (high breaking capacity type, without fuse) [ABS52C]](http://th.misumi-ec.com/en/linked/material/el/LSI1/PHOTO/LSI1_75.jpg?$product_view_b$)
![ABS series (distribution panel-type, no fuse) [ABS32FB]](http://th.misumi-ec.com/en/linked/material/el/LSI1/PHOTO/222000491785_002.jpg?$product_view_b$)
| Brand |
|---|
| Product Series |
| CAD |
| From |
| Days to Ship |
| Ampere frame |
| Rated block capacity AC 100 V(kA) |
| Rated block capacity AC 200 V(kA) |
| Rated block capacity AC 400 V(kA) |
| Rated Braking Capacity at Rated Voltage of VDC 250(kA) |
| Rated block capacity, voltages except VAC 100/200/400, VDC 250 |
| Number of Poles |
| Rated Current(A) |
| Mounting Method |
| Connection Method |
| Representative Standard |
| Dimension height(mm) |
| Dimension width(mm) |
| Dimension depth(mm) |
You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list. ![ABS [N]□□C series (high breaking capacity type, without fuse) [ABS52C]](http://th.misumi-ec.com/en/linked/material/el/LSI1/PHOTO/LSI1_75.jpg?$product_view_c$) | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list. ![ABS series (distribution panel-type, no fuse) [ABS32FB]](http://th.misumi-ec.com/en/linked/material/el/LSI1/PHOTO/222000491785_002.jpg?$product_view_c$) | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | |
| Brand | MITSUBISHI | MITSUBISHI | MITSUBISHI | MITSUBISHI | MITSUBISHI | Schneider Electric | MITSUBISHI | MITSUBISHI | MITSUBISHI | MITSUBISHI | MITSUBISHI | MISUMI | MITSUBISHI | LSIS | MITSUBISHI | LSIS | NITTO KOGYO | NITTO KOGYO | NITTO KOGYO | NITTO KOGYO |
| Product Series | Molded Case Circuit Breakers (MCCB) NF-CS Series with accessories | Molded Case Circuit Breakers (MCCB) NF-SVF Series with accessories | Molded Case Circuit Breakers (MCCB) NF-SVFU Series with accessories | Molded Case Circuit Breakers (MCCB) NF-SV Series with accessories | WS-V Series NF-KC, MCCB for Power Distribution Board / Control Panel | Molded Case Circuit Breakers (MCCB) NF-HCW Series with accessories | ABS [N]□□C series (high breaking capacity type, without fuse) [ABS52C] | NBE, circuit breaker (economic form), E series, rear surface shape | NE-S, circuit breaker (generic form), S series, front surface shape | |||||||||||
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| From | ฿ 2,570.00 Special Price On Sale Until 31/03/2025 | ฿ 2,812.00 Special Price On Sale Until 31/03/2025 | ฿ 1,968.00 Special Price On Sale Until 31/03/2025 | ฿ 10,402.00 Special Price On Sale Until 31/03/2025 | ฿ 9,868.00 Special Price On Sale Until 31/03/2025 | ฿ 2,050.31 | ฿ 5,372.00 Special Price On Sale Until 31/03/2025 | ฿ 4,217.00 Special Price On Sale Until 31/03/2025 | ฿ 4,640.00 Special Price On Sale Until 31/03/2025 | ฿ 9,197.00 Special Price On Sale Until 31/03/2025 | ฿ 7,350.00 Special Price On Sale Until 31/03/2025 | ฿ 1,769.03 Special Price On Sale Until 31/03/2025 | ฿ 14,338.00 Special Price On Sale Until 31/03/2025 | ฿ 1,812.10 | ฿ 5,397.00 Special Price On Sale Until 31/03/2025 | ฿ 977.26 | ฿ 4,600.03 | ฿ 7,357.41 | ฿ 6,111.72 | ฿ 7,115.53 |
| Days to Ship | Same day | Same day | Same day | 72 Day(s) | 72 Day(s) | Same day | 72 Day(s) | 72 Day(s) | Same day | 72 Day(s) | 72 Day(s) | 3 Day(s) | 72 Day(s) | 3 Day(s) | 72 Day(s) | 3 Day(s) | 5 Day(s) | 9 Day(s) | 9 Day(s) | 9 Day(s) |
| Ampere frame | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF | 100AF to 199AF |
| Rated block capacity AC 100 V(kA) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 5 | - | - | - | - | - |
| Rated block capacity AC 200 V(kA) | - | 30 | 30 | 50 | - | - | - | 100 | 5 | 100 | 50 | 35 | - | 35 | 5 | 10 | 35 | 35 | 35 | - |
| Rated block capacity AC 400 V(kA) | 30 | 10 ～ 30 | 10 | 25 | 10 | - | 30 | 50 ～ 75 | 1.5 | 50 ～ 75 | 25 | - | 25 | - | - | - | - | - | - | - |
| Rated Braking Capacity at Rated Voltage of VDC 250(kA) | 40 | 7.5 | - | - | - | - | - | 50 | - | 40 | - | - | - | - | - | - | 7.5 | 7.5 | 7.5 | - |
| Rated block capacity, voltages except VAC 100/200/400, VDC 250 | - | - | Available | Available | Available | - | Available | - | Available | Available | - | Available | Available | Available | Available | Available | Available | Available | Available | Available |
| Number of Poles | 2 / 3 / 4 | 3 | 2 / 3 | 3 | 3 | 3 / 4 | 3 | 2 / 3 / 4 | 3 | 3 / 4 | 2 | 2 / 3 | 3 | 2 / 3 | 3 | 2 / 3 | 2 / 3 | 2 / 3 | 2 / 3 | 2 / 3 / 4 |
| Rated Current(A) | 15 ～ 80 | 32 ～ 50 | 50 ～ 80 | 60 ～ 100 | 60 | 2.5 ～ 160 | 125 | 16 ～ 80 | 100 | 75 ～ 100 | 20 | 75 ～ 100 | 50 | 75 ～ 100 | 60 ～ 100 | 60 ～ 100 | 50 | 50 | 50 | 50 |
| Mounting Method | Fasten With Screws | Fasten With Screws / DIN/Screw retention | - | DIN rail mount | DIN rail mount | - | - | Fasten With Screws | DIN/Screw retention | - | DIN/Screw retention | Fasten With Screws | Fasten With Screws | Fasten With Screws | DIN/Screw retention | DIN/Screw retention | Fasten With Screws | Fasten With Screws | Fasten With Screws | Fasten With Screws |
| Connection Method | Surface type | Surface type | Surface type | Surface type | Surface type | - | Surface type | Surface type | Surface type | Surface type | Surface type | Surface type | Surface type | Surface type | Surface type | Surface type | Surface type | Embedded Type | Backside shape | Surface type |
| Representative Standard | PSE / CE / CCC | PSE / CE / CCC | PSE / CE / CCC | PSE / CE / CCC | PSE / CE / CCC | - | PSE / CE / CCC | PSE / CE / CCC | PSE | PSE / CE / CCC | PSE / CE / TUV / CCC | PSE / CE | CE / UL / TUV / CSA | PSE / CE | PSE / CE / CCC | PSE / CE | PSE | PSE | PSE | PSE |
| Dimension height(mm) | 130 | 130 | 130 | 130 | 150 | 161 | 130 | 130 | 96 | 130 ～ 165 | 130 | 130 | 120 | 130 | 97.5 | 96 | 155 | 200 | - | 155 |
| Dimension width(mm) | 60 ～ 120 | 90 | 60 | 75 | 75 | 105 ～ 140 | 90 | 90 ～ 120 | 75 | 105 ～ 120 | 75 | 75 | 75 | 50 ～ 75 | 75 | 75 | 60 ～ 90 | 115 ～ 150 | - | 60 ～ 120 |
| Dimension depth(mm) | 90 | 90 | 90 | 90 | 90 | 86 | 90 | 90 | 76 | 90 ～ 92 | 68 | 60 | 102 | 80 | 76 | 80 | 88 | 199 | - | 92 |
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Related Categories to Circuit Breakers (Low Capacity)
FAQ Circuit Breakers (Low Capacity)
- Question: Types of circuit breaker and their applications.
- Answer: Circuit breakers mainly are categorized based on application as per voltage.
1. Low Voltage Circuit Breaker
Low-voltage circuit breakers are typically used in applications such as lighting circuits, motor control centers, feeder circuits, and any application in which electrical power needs to be turned on and off and overcurrent protection is required.
2. Medium Voltage Circuit Breakers
Medium voltage breakers are designed to be operated electrically by a closing solenoid or a stored energy mechanism. Manual operation is used primarily for breaker maintenance.
3. HIGH-VOLTAGE CIRCUIT BREAKERS
High-voltage circuit breakers are mechanical switching devices that connect and break current circuits (operating currents and fault currents) and carry the nominal current in the closed position. - Question: What can cause the main circuit breaker to trip?
- Answer: The most common cause of a tripped circuit breaker is an overload in that circuit. Each circuit is only intended to carry a certain electrical load, and if it exceeds this load, it will cause the breaker to trip. This is important, as overloading a circuit can cause the wiring to heat up and potentially create a fire risk. In fact, it is this excess heat running through the circuit that causes the breaker to trip.
- Question: How we know that have to replace breaker?
- Answer: 1. Breaker trips frequently.
2. Burning smell coming from the electrical panel.
3. Poorly performing appliances and light fixtures.
4. Breaker fails to stay in reset mode.
5. Visible signs of physical damage. - Question: How do I know whether to get a 15 or 20 A circuit breaker?
- Answer: Calculate the total current of all electrical equipment. that want to be connected to the breaker The sum of the calculated current should not exceed 80% of the breaker capacity. For example, a 15 A breaker can be connected to external devices up to 12A (15 x 0.80 = 12), and a 20 A breaker can be connected to external devices up to 16A (20 x 0.80 = 16). This can lead to calculation errors and can cause a fire.
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