MRT-PRM Series
Product Guide
Multi Range Time Delay Switches
Overview
MRT-PRM
Push button activation with optional external trigger
The MRT-PRM series of time delay switches are designed to provide
timed control of lighting, heating or ventilation loads. Using push button,
or remote activation, the user can switch on a load for a preset time period and have the load turn off automatically after the time period has
elapsed.
Multiple timing ranges come as standard to allow the time out period to
be set accurately. Time setting is achieved using switches and a thumbwheel behind the face plate..
Several modes of operation are selectable using switches:
On/off: triggering the timer will turn on the load and start the timing.
Triggering the timer again during timing will immediately turn off the
load and stop the timing.
Compatible with all BS4662
dimensions back boxes.
Remove top and bottom lugs if
fitted.
Wire the MRT timers as in diagram 1. Connection
of the slave trigger is optional on all units except
the MRT-REM-PRM.
Applying a live to the trigger will start the timer
running. A momentary switch can be used, for
example, in corridor lighting applications. A permanent input can be used, for example, in pump
overrun applications.
To switch from more than one position simply
wire two or more units in parallel to achieve
two way and intermediate switching, or use the
slave trigger.
For lighting applications that call for the replacement of a three wire switching system follow
diagram 2, and set to non-resetting mode.
Diagram 1 Standard Wiring
MRT-REM-PRM
Remote activation—external trigger only
Resetting: triggering the timer will turn on the load and start the timing.
Triggering the timer again during timing will re-start the timing period
from scratch. When using an external trigger In this mode, the timer will
not start until the trigger is removed making it ideal for pump or fan
overrun applications.
Non-resetting: triggering the time will turn on the load and start the
timing. Triggering the timer again during timing will have no affect.
An LED indicator illuminates during the timing period.
Installation & Wiring
<25mm
Do not
overtighten
Diagram 2 Wiring for three wire switching circuits
Use the extender if there is less than
25mm free space.
REMEMBER—put the wires through the
extender before connecting.
Settings
Time setting
Time range
Fault Finding
LOAD DOES NOT COME ON
Check to see if the live supply to the circuit is
good. Strap across the L and LIVE OUT terminal to check.
LOAD DOES NOT GO OFF
Check that the time setting is correct.
When using external triggers, ensure that live is
removed from the trigger terminal to enable the
timer to start (for resetting mode only).
Mode
Specification
LOAD
16 Amp resistive load
10 Amp incandescent lighting
6 Amp fluorescent lighting
3 Amp compact fluorescent lighting
3 Amp low energy lighting
3 Amp low voltage lighting (switch primary of transformer)
3 Amp fans and ventilation equipment
Switch SON lighting loads via a contactor
Quartz halogen heaters: 2600W max, recommended timing 30 minutes, for lower timing switch
SUPPLY VOLTAGE 220-240 Volts AC 50 Hz
TIMING PERIOD Adjustable 1 second to 2 hours in ranges
TERMINAL CAPACITY 2.5mm2
MATERIAL Flame retardant ABS
TYPE Class 2
TEMPERATURE -10°C to 35°C
CONFORMITY EN60669-2-1
EN55015
via contactor
Part Numbers
MRT-PRM Push button activated multi-range timer
MRT-REM-PRM Remote activated multi-range timer
IMPORTANT NOTICE!
This device should be installed by a qualified electrician in
accordance with the latest edition of the IEE Wiring
Regulations and any applicable Building Regulations.
FM 45789 EMS 534520
Due to our policy of continual product improvement CP Electronics reserves the right to alter the specification of this product without prior notice.
C.P. Electronics Ltd
Brent Crescent
London
NW10 7XR
United Kingdom
Tel: + 44 (0) 333 900 0671
Fax: + 44 (0) 333 900 0674
www.green-iswitches.co.uk
enquiry@green-iswitches.co.uk
Ref: #WD282 Issue 3
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