Alarm Wiring Relay Protection
Inductive loads (bells, buzzers, relay, contractors, solenoid valves, etc.) connected to the Sustained Alarm, Instant Alarm, and Fault relays must be clamped down as shown on diagrams in Instant Alarm Relay. Unclamped inductive loads can generate voltage spikes in excess of 1000 volts. Spikes of this magnitude will cause false alarms and possible damage.
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Figure 17 Relay Contacts
| 1 | General Purpose Rectifier Diode. 1N4005 or Equivalent (Note Polarity) | 5 | Metal Oxide Varistor Rated for 150 VRMS, General Electric V150LA20A or Equivalient |
| 2 |
Switched Load Coil -Bell, Buzzer, Relay, Contactor, Solenoid, Valve, etc. |
6 |
Switched Load Coil -Bell, Buzzer, Relay, Contactor, Solenoid, Valve, etc. |
| 3 | DC Control Voltage | 7 | 117 VAC Control Voltage |
| 4 | Protection circuit for relay contacts when switching a DC load. | 8 | Protection circuitt for relay contacts when switching an AC load |
Refer to the figure in Sustained Alarm Relay for all relay connections.