Air Circuit Breakers

Technical specifications

Standard                                     : IEC 60947-2

Number of poles                         : 3-pole, 4-pole

Rated operational voltage Ue    : 400 V, 690 V

Rated insulating voltage Ui        : 1000 V

Rated frequency                       : 50 – 60 Hz

Rated impulsed withstand voltage Uimp: 12 kV

Neutral pole current-carrying capacity for 4-pole CBs: 100% In

Version                                       : Fixed version, Withdrawable 

Modular design

Components like auxiliary releases, motorized operating mechanisms, electronic releases, current sensors, auxiliary circuit signaling switches, automatic reset devices, interlocks and engagement operating mechanisms can all be exchanged or retrofitted in the back ground, thus allowing the circuit breaker to be adapted to new, changing required.

Communication

The use of modern communication-capable circuit breakers opens up completely new possibilities in terms of start-up, parameterization, diagnostics, maintenance and operation. This allows varieties of ways of reducing costs and improving productivity in industrial plants, buildings and infrastructure projects.

Easy wiring by different terminals

A wide variety of terminals are offered, to guarantee an optimal solution for connection to the power circuit under different applications.

 

Molded Case Circuit Breaker

Features

Residual current protection for  three phases.
Rated residual current and conventioanl action time are adjustable.
Low voltage protection, residual current protection module can well work even if the pahse voltage drop to 50 V.
Residual current alarm.

Overview

MCCB with earth leakage protection;
From 16 A to 630A;
Size A, B, C and D.

Applications and functions

Protect plant and equipment against overload or damage by ground faults (ground-fault protection)    
Protection against fire hazard caused by insulation faults
Switching and protection devices for motors, transformers and capacitors

Available in the following versions:
Power protection: The overload and short-circuit releases are designed for the protection of cables, leads and non-motor loads
Motor protection: The overload and short-circuit releases are designed for optimized protection and direct-on-line starting of induction squirrel-cage motors.

Technical specifications

Standards                                       : IEC 60947-2, IEC 60947-4-1
Number of poles                             : 3-pole, 4-pole
Rated insulating voltage Ui             : 800 V
Rated operating voltage Ue            : 400 V
Rated frequency                              : 50/60 Hz
Rated impulsed withstand voltage Uimp: 8 kV

Switch-disconnector

Technical specifications

Standard                                                   : IEC 60947-3
Number of poles                                       : 3-pole, 4-pole
Rated operating voltage Ue                      :400 V
Rated insulating voltage Ui                       : 500 V, 800 V
Rated frequency                                       : 50/60 Hz
Rated impulse withstand voltage Uimp     : 6 kV, 8 kV
Rated short-time withstand current at 1 s Icw: 760 A to 9600 A

Overview

The 3SM8G switch disconnector derive from the 3SM8N molded case circuit breaker, so they have the same overall dimensions, installation and accessories. The only difference is that 3SM8G switch disconnector is not configurated with protection trip units.

Applications and functions

Isolation:

The main function carried out by switch disconnector is isolate the circuit which they are inserted in. When their contacts are open, they are at a distance which is enable to prevent arc from striking and provide safety isolation.

Protection:

Due to the absent configuration of protection trip unit inside, 3SM8G switch disconnector is with no possibility to protect against overload, short-circuit and ground fault etc.
Besides, the switch disconnector must be protected on its supply side by a coordinated device which is enable to protect it against short-circuit.