Specifications

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Class A (NFPA Style D)/Class B (NFPA Style A and B)
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- Up to 5,000 ft. of PROTECTOWIRE per circuit.
- Any combination of normally open contact devices.
- Up to (30) Two-Wire Smoke Detectors per circuit.
- Smoke Detectors NS-series #SLR-24, #SIJ-24, #SLR-24H
- Detector Identifier - HD-3 Base Identifier - HB-3
Note: Smoke detectors shall not be employed on intrinsically safe detection circuits.
Power limited wiring must be isolated from non-power limited wiring.
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24VDC, 200 mA Max. (Power Limited, Non-Supervised). For supervision see 4-wire detector power supervision section of this
manual. Source is resettable by depressing the “Detector Reset” button located on the top left corner of the main board.
Note: It is assumed that 4-wire detector power is not utilized when the system current capacity is calculated. When it is employed,
deduct its current load (200 mA Max.) from the available alarm device current for the system. Used for Special Application
purposes. See Installation wiring diagram (IWD).
ELR-4.7K
Voltage Standby 22VDC nominal, power limited
Current to ensure alarm 15 mA (1K ohm loop resistance minimum)
Short circuit current 35 mA
Supervision current 4.5 mA
End-of-line resistor 4.7 K ohm 1/2 Watt (Class B only)
Maximum feed cable resistance
100 ohms. Feed cable may consist of any combination of
Protectowire or copper feed
Ground Fault Impedance rating Less than 2.2K ohms impedance