What is the purpose of terminals 95 and 96 on an overload relay?

In electrical systems, terminals 95 and 96 on an overload relay serve a crucial role in motor protection. Terminal 95 is the common terminal for the trip circuit, and terminal 96 is the normally close contact. When the overload relay detects excessive current in a motor, it activates the trip circuit. This action causes the normally close contact at terminal 96 to open, initiating protective measures, such as disconnecting the motor from the power supply, to prevent damage due to overcurrent.

How do overload relays contribute to electrical safety?

Overload relays enhance electrical safety by monitoring motor currents. If currents exceed safe levels, the relay triggers protective actions, preventing motor overheating and potential fire hazards. By swiftly disconnecting power during overloads, they safeguard equipment, reduce downtime, and comply with safety standards. Overload relays offer early warnings of issues, allowing for timely maintenance. Customizable to specific current limits, they contribute to adaptability and seamless integration with control systems, ensuring efficient protection and reliable operation in various electrical applications.

What factors determine the correct setting for an overload relay?

The correct overload relay setting depends on factors such as motor rating, type, and efficiency. Considerations include inrush current during startup, operating conditions, and load variations. Crucial aspects involve service factors, thermal models, and adherence to standards. Following manufacturer recommendations, finding a balance between protection sensitivity and avoiding unnecessary tripping is key. Regular reviews accommodate changes in the electrical system or equipment, ensuring optimal protection, compliance with standards, and reliability across various applications.

What role does an overload relay play in a 3-phase system?

In a 3-phase system, an overload relay protects electric motors by monitoring current. When it detects excess current, signaling an overload, the relay activates a trip circuit that rapidly disconnects the motor. This prevents overheating, safeguarding the motor from damage and mitigating fire hazards. The overload relay contributes to overall system reliability, with adjustable settings and integration capabilities enhancing its adaptability and automation in motor protection.

How can the principle of overload be beneficial in relay design?

The principle of overload in relay design is pivotal for electrical system safety. Overload relays, responsive to excessive current, disconnect power swiftly, preventing equipment damage and fire hazards. Adjustable settings accommodate diverse motor requirements, ensuring adaptability. Early warning features facilitate timely maintenance, minimizing downtime. This principle aligns with safety standards, promoting compliance. Beyond protection, overload relays contribute to energy efficiency by optimizing motor performance under varying loads. Overall, they play a crucial role in enhancing equipment longevity, system reliability, and adherence to safety regulations in electrical systems.

What distinguishes bimetallic overload relays from electronic types?

Bimetallic and electronic overload relays differ in technology and performance. Bimetallic relays use physical expansion of bimetallic strips for current detection, providing simplicity but less precision. Electronic relays, employing sensors and microprocessors, offer higher sensitivity, adjustability, and advanced motor protection. While bimetallic relays are cost-effective for basic applications, electronic relays excel in complex systems, delivering enhanced performance, adaptability, and reliability. The choice depends on the application's needs, with bimetallic relays suited for simplicity and electronic relays for advanced functionality.

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Overload Relays（Auxiliary Contact：Other）

A thermal relay is a type of relay that protects a motor from overcurrent. It is called "thermal relay" because it operates after detecting a rise in the temperature of the motor coil. In some designs, the terminals are equipped with a cover to improve safety by protecting against electric shocks during maintenance or inspection. Most thermal relays are composed of a heater element and bi-metal section. When current flows through the heater element, the bi-metal section bends and the contacts open. If the relay is activated, eliminate the cause before restarting operation. Types include an automatic type that resets automatically after activation, and a manual type where the user resets the relay by pressing a button after the bi-metal has cooled. Because a thermal relay itself does not have a shut-off function, it is usually used in combination with an electromagnetic contactor.

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Specification/Dimensions

Type
- Thermal relay
Clear

Operating Method
- Irreversible type
- Other
Clear

Motor capacity 400 to 440-VAC class(kW/A)
0.2

0.4

45/82

55/105

75/125

90/150

110/180

160/250

200/330
Clear

Motor Capacity VAC 200–220 Class(kW/A)
0.05/0.52

0.1/0.82

0.2/1.3

0.4/2.1

0.75/3.3

1/5

1.5/6.5

1.5/7.5

2.2/8.5

3.7/11

3.7/15

5.5/19

5.5/21.5

7.5/27

7.5/30

7.5/34

15/55

22/82

30/105

37/125

45/150

55/180

75/250

110/330
Clear

Coil rated voltage(V)
690
Clear

Number of Poles
- 3
Clear

Auxiliary Contact
- 1a1b
- Other
Clear

Representative Standard
- CE
- UL
- CUL
- TUV
- CCC
- CSA
Clear

Dimension length(mm)
51

55

57

70.5

72

73.2

73.5

74.6

76

77

80

80.6

81

84

87

91.5

97

101

102.5

105.5

106.3

106.9

111

112

123

126

144

149

159

172

183
Clear

Dimension width(mm)
44

45

46

53

54

54.9

55

63

68

69.9

70

74.3

78.5

83.5

87

88

89

100

104

114

115

130

138

142

149

160

165

173

197
Clear

Dimension thickness(mm)
58.5

59

59.5

61.5

63.7

68

72

76.5

78

78.6

79

83.5

88.3

89.7

90

95.6

99

99.5

100

101.4

103

105

106.9

109.5

118

120

121

124.5

126

127

133.5

134

137

140

141

144.5

146

149

151

158.5

160

166.5

170

179

182

193
Clear

Brand	(0) (0) ABB (0) FUJI ELECTRIC (1) MITSUBISHI (0)
CAD	2D 3D
Days to Ship	All Same day 3 Day(s) or Less 8 Day(s) or Less 31 Day(s) or Less 45 Day(s) or Less Others

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S Series Embedded Type Thermal Relay

FUJI ELECTRIC

[Features]
· It is optimum for surface control of the control center and for overload detection of transformer secondary side in high voltage receiving equipment.
· It can be embedded by one touch on the panel surface.
· You can adjust the setting current, trip, reset operation from the front.

From: ฿ 3,821.67
Days to Ship: 90 Day(s)

90 Day(s)


Brand
Product Series
From
Days to Ship
Type
Operating Method
Motor capacity 400 to 440-VAC class(kW/A)
Motor Capacity VAC 200–220 Class(kW/A)
Coil rated voltage(V)
Number of Poles
Auxiliary Contact
Representative Standard
Dimension length(mm)
Dimension width(mm)
Dimension thickness(mm)

	You can add up to 6 items per a category to the compare list.Compare
Brand	FUJI ELECTRIC
Product Series	S Series Embedded Type Thermal Relay
From	฿ 3,821.67
Days to Ship	90 Day(s)
Type	Thermal relay
Operating Method	Irreversible type
Motor capacity 400 to 440-VAC class(kW/A)	-
Motor Capacity VAC 200–220 Class(kW/A)	-
Coil rated voltage(V)	-
Number of Poles	3
Auxiliary Contact	Other
Representative Standard	-
Dimension length(mm)	76
Dimension width(mm)	70
Dimension thickness(mm)	88.3

Related Categories to Overload Relays

FAQ Overload Relays

Question: What is the purpose of terminals 95 and 96 on an overload relay?: Answer: In electrical systems, terminals 95 and 96 on an overload relay serve a crucial role in motor protection. Terminal 95 is the common terminal for the trip circuit, and terminal 96 is the normally close contact. When the overload relay detects excessive current in a motor, it activates the trip circuit. This action causes the normally close contact at terminal 96 to open, initiating protective measures, such as disconnecting the motor from the power supply, to prevent damage due to overcurrent.
Question: How do overload relays contribute to electrical safety?: Answer: Overload relays enhance electrical safety by monitoring motor currents. If currents exceed safe levels, the relay triggers protective actions, preventing motor overheating and potential fire hazards. By swiftly disconnecting power during overloads, they safeguard equipment, reduce downtime, and comply with safety standards. Overload relays offer early warnings of issues, allowing for timely maintenance. Customizable to specific current limits, they contribute to adaptability and seamless integration with control systems, ensuring efficient protection and reliable operation in various electrical applications.
Question: What factors determine the correct setting for an overload relay?: Answer: The correct overload relay setting depends on factors such as motor rating, type, and efficiency. Considerations include inrush current during startup, operating conditions, and load variations. Crucial aspects involve service factors, thermal models, and adherence to standards. Following manufacturer recommendations, finding a balance between protection sensitivity and avoiding unnecessary tripping is key. Regular reviews accommodate changes in the electrical system or equipment, ensuring optimal protection, compliance with standards, and reliability across various applications.
Question: What role does an overload relay play in a 3-phase system?: Answer: In a 3-phase system, an overload relay protects electric motors by monitoring current. When it detects excess current, signaling an overload, the relay activates a trip circuit that rapidly disconnects the motor. This prevents overheating, safeguarding the motor from damage and mitigating fire hazards. The overload relay contributes to overall system reliability, with adjustable settings and integration capabilities enhancing its adaptability and automation in motor protection.
Question: How can the principle of overload be beneficial in relay design?: Answer: The principle of overload in relay design is pivotal for electrical system safety. Overload relays, responsive to excessive current, disconnect power swiftly, preventing equipment damage and fire hazards. Adjustable settings accommodate diverse motor requirements, ensuring adaptability. Early warning features facilitate timely maintenance, minimizing downtime. This principle aligns with safety standards, promoting compliance. Beyond protection, overload relays contribute to energy efficiency by optimizing motor performance under varying loads. Overall, they play a crucial role in enhancing equipment longevity, system reliability, and adherence to safety regulations in electrical systems.
Question: What distinguishes bimetallic overload relays from electronic types?: Answer: Bimetallic and electronic overload relays differ in technology and performance. Bimetallic relays use physical expansion of bimetallic strips for current detection, providing simplicity but less precision. Electronic relays, employing sensors and microprocessors, offer higher sensitivity, adjustability, and advanced motor protection. While bimetallic relays are cost-effective for basic applications, electronic relays excel in complex systems, delivering enhanced performance, adaptability, and reliability. The choice depends on the application's needs, with bimetallic relays suited for simplicity and electronic relays for advanced functionality.