Independent power supply with build-in power source,directly draws power from the incoming end to avoid the risk of protection function failure caused by external power supply failure.
● Overload protection
● Short circuit protection
● Isolation
● Controlling
● Used in residential building, non-residential building, industry, energy and infrastructure
Applications And Functions For Thermal Relay
● Protecting the loads from overload and phase failure
● Implementing short-circuit protection by means of a fuse or circuit breaker
● Used for the protection of motors
Instruction of type code
Techinical specifications for assembled thermal relay of type 3SC8-K
● Type: 3SR8-K
● Standard: IEC 60947-4-1
● Tripping class: 10 A
● Number of connecting pin: 4
● Rated operational voltage Ue (V): up to 690
● Rated insulation voltage Ui (V): 690
● Rated impulse withstand voltage Uimp (kV): 6
● Rated current range In (A):
0.11-0.16, 0.16-0.23, 0.23-0.36, 0.36-0.54,
0.54-0.8, 0.8-1.2, 1.8-2.6, 2.6-3.7,
3.7-5.5, 5.-8, 8-11.5, 10-14
● Signalling: Trip indicator
● Tightening torque (N·m): 0.8
● Degree of protection: IP20
● Ambient air temperature (ºC): -5 to +40, max. 95 % humidity
● Storage temperature (ºC): -40 ~ +75
● Maximum operating altitude (meters): 2000
● Flame resistance: V1
● Mounting: directly under the contactor
Selection and ordering data
3SR8-K thermal relay matched with contactor 3SC8-K
Tripping curve of thermal relay 3SR8-K
Average operating time related to multiples of the current setting (Class 10 A)
1. Setting: at lower end of scale
2. Setting: at upper end of scale
Outline and installation dimensions (3SC8-K, 3SR8-K)
