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 3SR8
● 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
Technical specifications for assembled thermal relay of type 3SR8
Selection and ordering data
Series 3SR8
Mounting block
Action characterisitics for thermal relay 3SR8
Average operating time related to multiples of the current setting (Class 10 A)
Balanced 3-phase operation, from cold state
1. Setting: at lower end of scale
2. Setting: at upper end of scale
Balanced operation with 2 phases only, from cold state
Tripping curve for thermal relay 3SR8
1. Equilibrium running, 3 phase, start from cold state
2. Equilibrium running, 2 phase, start from cold state
3. Equilibrium running, 3 phase, after long period of setting current (hot state)
Outline and installation dimensions
Operating principle diagram of overload relay
