Output Circuits Installation
MS-2/MS-4 PN 51512:D 10/18/04 23
2.4.2 DC Power Output Connections
Resettable 24 VDC power is available on both the MS-2 and MS-4 control panels.
Nonresettable 24 VDC power is available only on the MS-4.
2.4.3 Relays
The MS-2 and MS-4 control panels provide an alarm and fail-safe trouble relay and the
MS-4 also provides a supervisory relay. Each Form-C relay is rated for 2 amps @
30VAC (resistive).
Note that relay connections may be power-limited or nonpower-limited, provided that
0.25” minimum spacing is maintained between conductors of power-limited and
nonpower-limited circuits.
TB1
Figure 2.7 Auxiliary Power
4-Wire Smoke Detector Power (500 mA)
24 VDC filtered, resettable power for 4-wire smoke detectors
can be obtained from these terminals (power-limited)
Nonresettable Power (500 mA) - MS-4 Only
24 VDC filtered, nonresettable power can be
obtained from these terminals (power-limited)
+ - + -
ms-4tb1.cdr
TB5
TB6
TB7
TROUBLE
C TRBL NORM
C NC NO
ALARM
SUPV
C NC NO
Figure 2.8 Relay Terminals
Note: Relay contacts are shown with
power applied to the panel and no active
troubles, alarms or supervisories.
The Trouble Relay is a fail-safe relay
which will transfer on any trouble or
total power failure.
ms4relay.cdr
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