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Fibre Optic Master and Remote Site

User Handbook

Document Number: 60-212701HBK - Issue No. 1 Page 35 of 50

4.2.4.13. 12V Relay Board (20-001601)

The General Purpose Relay Board allows the inversion of signals and the isolation of circuits. It is

equipped with two dual pole change-over relays with completely isolated wiring, accessed via screw

terminals. Both relays are provided with polarity protection diodes and diodes for suppressing the

transients caused by "flywheel effect" which can destroy switching transistors or induce spikes on

neighbouring circuits. Its common use is to amalgamate all the alarm signals into one, volts-free relay

contact pair for the main alarm system.

20-001601 Specification

PARAMETER SPECIFICATION

Operating voltage 8 to 30V (floating earth)

Alarm threshold Vcc - 1.20 volt +15%

Alarm output relay contacts:

Max. switch current 1.0Amp

Max. switch volts 120Vdc/60VA

Max. switch power 24W/60VA

Min. switch load 10.0µA/10.0mV

Relay isolation 1.5kV

Mechanical life

>2x10

operations

Relay approval BT type 56

Connector details Screw terminals

operational -10°C to +60°C Temperature

range

storage -20°C to +70°C

4.2.4.14. 24V Relay Board (20-001602)

The General Purpose 24V Relay Board (20-001602) allows the inversion of signals and the isolation

of circuits. It is equipped with two dual pole change-over relays RL1 and RL2, with completely isolated

wiring, accessed via screw terminals. Both relays are provided with polarity protection diodes and

diodes for suppressing the transients caused by "flywheel effect" which can destroy switching

transistors or induce spikes on neighbouring circuits. Its common use is to amalgamate all the alarm

signals into one, volts-free relay contact pair for the main alarm system.

20-001602 Specification