MK Electric Catalogue No. 49

586 / 759

CIRCUIT PROTECTION
586
Standards and approvals
All Sentry RCBOs are designed to fully comply
with the relevant requirements of BS EN 61009-1,
BS IEC 61 009-2-2, BS 61543 for EMC.
The RCBOs feature positive contact status
indication in accordance with 17th edition IEE
Wiring Regulations (537.2.2.2 and 537.3.2.2).
TECHNICAL SPECIFICATION
ELECTRICAL
OPERATING VOLTAGE
230V a.c.
OPERATING FREQUENCY
50Hz
RATED SHORT CIRCUIT CAPACITY ICN
6,000A
SERVICE SHORT CIRCUIT CAPACITY ICS
6,000A
When backed up by a BS 1361, 100A fuse, then
the breaking capacity of the RCBO is increased to
16,000A.
Type AC
PHYSICAL
AMBIENT OPERATING TEMPERATURE
–25°C to + 40°C
IP RATING
Front face IP4X, screw IP2X
TERMINAL CAPACITY
Line in 25mm2
Line and neutral out 25mm2
TIGHTENING TORQUE
2.5Nm
MAX. INSTALLATION ALTITUDE
2000 metres
FEATURES
l Single module
l Meet BS EN and IEE Wiring Regulation
requirements
l Allows both overcurrent and earth
fault protection and detection
l Available in a range of current ratings
l Tunnel type terminals
l Generous terminal capacity
l Positive contact status indication
Sentry Technical
Residual Current Breakers with
Overcurrent Protection (RCBOs)
Description
The Sentry range features solid neutral type single pole RCBOs in one module
format.
The one module Sentry RCBOs are a combination of a Type B MCB and a Residual
Current Device. This enables both overcurrent protection and earth fault current
protection to be provided by a single unit.
This combination allows earth fault protection to be restricted to a single circuit, thus
ensuring that only the circuit with the fault is interrupted. (When groups of circuits
are protected by an RCD, all circuits would be interrupted under fault conditions,
which may cause unnecessary inconvenience).
The operating switch on all Sentry RCBOs may be locked in either the ON or OFF
position without affecting the ability of the trip mechanism to operate.
Sentry RCBOs feature tunnel terminals of generous capacity, with 25mm2 for live
supply for live and neutral load terminals. The neutral supply (blue) and earth supply
(white/cream) are provided via flying leads.
Mode of operation
As the RCBO is a combination of an MCB and RCD, reference should be made to
the relevant technical information regarding these devices.