Circuit breakers
xPole Combined RCD/MCB Device mRB64/M4-PT, 3+N-pole with neutral conductor
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xPole Combined RCD/MCB Device mRB64/M4-PT, 3+N-pole with neutral conductor

The mRB64/mRBM4 in PT-version is a line voltage-independent electromechanical residual current operated circuit breaker with integrated overcurrent protection, especially designed for usage in British Standard distribution systems with permanently connected neutral conductor (l = 950 mm). These combined MCB/RCD devices are not only available as AC and pulse current sensitive "standard type" A, but also as AC.

The mRB64-PT/mRBM4-PT circuit breakers are available with rated currents from 6 up to 32 A, in tripping characteristics B, C or D. Their switching capacity is 6 kA. A red-green contact position indicator and a white-blue tripping indicator makes it immediately apparent what is going on.

Rated currents
up to 32 A
Tripping characteristics
B, C and D
Rated Breaking Capacity
6 and 10 kA

Core features

  • High-quality residual current device / miniature circuit breaker combination
  • Line voltage-independent tripping
  • Version PT especially for applications in BS-distribution systems 
  • Permanently connected 950 mm long neutral conductors
  • Contact position indicator red – green
  • Fault current triping indicator white – blue
  • Wide variety of rated tripping currents
  • Rated currents up to 32 A
  • Tripping characteristics B, C, D
  • Rated breaking capacity 
    • 6 kA (mRB64-PT)
    • 10 kA (mRBM4-PT)
  • Compatible with standard busbar
  • Twin-purpose terminal (lift/open-mouthed) above and below
  • Busbar positioning optionally above or below
  • Free terminal space despite installed busbar
  • Guide for secure terminal connection
  • 3-position DIN rail clip, permits removal from existing busbar system
  • Comprehensive range of accessoires can be mounted subsequently
  • Switching toggle (MCB component) in color designating the rated current

Suitable RCD/MCB types for all contingencies

Wiring the circuits separately increases the operational safety of an electrical system.

  • Type A: Protects against special forms of residual pulsating DC which have not been smoothed.
  • Type AC: This type only detects pure sinusoidal AC residual currents.

All in one device

Eaton's high quality standard guarantees comprehensive personal- and equipment protection by combining the functionalities of a residual current circuit breaker with those of a miniature circuit breaker. This means our customers spend less time and effort wiring while still protecting the system against overload, short circuit and residual current. Using Eaton's line of RCBOs, your electrical system will increase in safety and reliability.

IEC Standard quality design

The RCBO line adheres to the IEC standard of IEC/EN 61009 – an IEC region as well as European standard for RCDs with integrated overcurrent protection (RCBOs). This applies to both the line voltage-independent and line voltage-dependent RCDs/MCBs with rated currents up to 125 A for fixed installations.

All requirements of IEC/EN 61009 are 100 % fulfilled by Eaton's RCBO line. All required standards are printed on the devices.
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