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Air Circuit Breakers

Air Circuit Breakers (ACB)

ACB Appearance

  • Air circuit breaker is a circuit breaker for the purpose of protecting low voltage circuit, mainly for energizing and cutting off high current.
  • It is used as the master of a factory and building, and as a main circuit breaker of a ship, and it is possible to attach various accessories according to the purpose.
  • We also have a draw-out installation method with high maintainability.

Electronic Trip Relay (ETR)

  • Electronic Trip Relay trigger circuit outputs a trigger signal to energize the trip coil, when the CT detects the value exceeds the predetermined value.

ETR

Electronic Trip Relay

WS

■General Use : WS

The WS relay is a general use protection relay of ACB, LTD, STD and Inst characteristics are adjustable.

WM

■Generator Protection Use : WM

The WM relay is mainly used for the protection of the generator.
Current setting Ir is fixed at the value complying with the rating of generator.

WB

■Special Use : WB

The WB relay is effective for the combination with the external OCR without severely decreasing the breaking capacity.
The characteristics are Inst/MCR only.

Accessories for Relay

GFR

■Ground Fault Protection (GFR)

The ground fault protection (GFR) of several hundred amperes is possible.

ER

■Earth Leakage Protection (ER)

By combining the ETR with earth leakage protection (ER) and External ZCT, earth leakage protection is possible.

Appearance of display

■Display Module (DP1, DP2)

This is the display module and shows the various information like measured value, trip and alarm status, ETR status for display and output contacts setting etc...

Appearance of module

■Extension Module (EX1)

This is the extension module that provides various measuring function with combining Display module DP1/DP2 and VT unit.

Accessories

Skeleton

Connection

Connection image

Durability

  • The times of mechanical durability of ACB is significantly increased compared with MCCB.

Operating durability

Operating durability Model
ACB
AE2000-SWA~AE6000-SW
MCCB
NF2000-S~NF4000-S
Without rated current 25,000 times (AE630-SW~AE2000-SWA)
20,000 times (AE2000-SW~AE4000-SWA)
10,000 times (AE4000-SW~AE6300-SW 3P)
5,000 times (AE4000-SW~AE6300-SW 4P)
3,000 times (NF2000,2500-S)
2,000 times (NF3200,4000-S)
With rated current
ACB: AC690V
MCCB: AC440V
5,000 times (AE630-SW~AE1600-SW)
1,500 times (AE2000-SWA~AE2500SW)
1,000 times (AE3200-SW, AE4000-SW~AE6300-SW)
500 times (AE4000-SWA)
500 times

Interface Unit

  • By adding various interface units, connection to the main network is available. *CC-Link, MODBUS, PROFIBUS-DP
  • It is possible to circuit breaker ON/OFF management by remote control and monitoring of various information.

Network Instance

Network instance