Scope of application
The SE series plastic shell circuit breaker (hereinafter referred to as the circuit breaker) is suitable for AC 50Hz, rated current from 16A to voltage 630A, rated insulation voltage 690V, and rated working voltage 400V and below. This series of circuit breakers is used in power distribution networks to distribute electrical energy and serve as overload, short circuit, and undervoltage protection for lines and electrical equipment. Under normal circumstances, circuit breakers can also be used for infrequent switching of lines. Circuit breakers with a 400A enclosure level and below can also be used to protect motors and their infrequent starting.  

Model and its meaning


1) Circuit breakers for power distribution have no code; The circuit breaker for protecting the motor is represented by 2;
2) : Handle direct operation without code: Motor operation is represented by D; The rotating handle operation is represented by Z.

Release mechanism and accessory code

Structural features and working principle
This series of circuit breakers consists of a contact system, operating mechanism, trip system, arc extinguishing system, and insulation components. When the overload current or short-circuit current reaches or exceeds its specified value, the circuit breaker will automatically trip, thereby cutting off the power supply and protecting the equipment on the load side.  

Main technical parameters
1. Main technical parameters of circuit breakers

2. Main technical parameters of the control circuit



3. Main technical parameters of auxiliary contacts and alarm contacts

Appearance and installation dimensions
The appearance and installation dimensions are shown in the diagram and table

Circuit breaker appearance and installation dimensions, wiring dimensions after board installation

Unit in millimeters

Ordering Instructions
When placing an order, the user must specify the following:
1) Model and name of the circuit breaker;
2) Rated current of circuit breaker;
3) The accessory name, specification, and combination code of the circuit breaker; When using undervoltage release and shunt release, the voltage value of the working voltage (or control power supply voltage) should be indicated;
4) Wiring methods: front board wiring, back board wiring, plug-in (front board wiring can be omitted)
5) Quantity.
For example: SE-400, Level 3, rated current 350A, shunt release (coil rated voltage AC 220V) and instantaneous release set current multiple 101n, pre board wiring, 50 units.
It should be written as: SE-400. 3310、350A、AC220V、101n、 50 units.