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The SPS has one programmable relay, Aux 1, with one set of voltage-free contacts (see
below).
The Alarm Relay 4100-6033 is fitted as standard to 4100U-S1. This has 3 relays, each
with one set of normally open (or normally closed) contacts available on a screw terminal
block (see Chapter 4).
• The relay must be configured in the Programmer.
• The relay circuit is rated to switch 2A resistive or 1A inductive at 30VAC or 32VDC.
• Relay contacts are Form C voltage-free contacts (but with a 40V transorb from
common to Earth). Do not switch voltages greater than this rating, or damage may
result.
• When power through the relay contacts is provided by the SPS Auxiliary Power
output, wiring is power-limited.
• The relay circuit is not supervised.
The three relays have default functions of Fault (trouble), Isolate (supervisory) and
Alarm, and are typically used for Brigade Signalling (refer to Chapter 4 for jumper
settings and other Brigade device information).
Continued on next page
SPS Relay Wiring
Overview
Aux 1 Relay
Alarm Relay Card