Bosch D125B - Specifications

Powered loop interface Specifications | en 11
Bosch Security Systems, Inc. Installation instructions 2018.06 | 4.0 | F.01U.036.340
9 Power-limited, supervised positive to A
loop detectors (see Wiring sensor
loops, page 6)
10 Earth ground
11 Power‑limited, supervised switched
auxiliary power from the control
panel’s relay C to the switching relay
12 For 24V applications, cut this wire
13 Negative connection from the auxiliary
power supply to the negative terminal
of the relay and panel common
14 Positive connection from the auxiliary
power supply to the positive terminals
of the relay
15 UL Listed regulated, power‑limited auxiliary power supply (12VDC or 24VDC) for fire
protection systems
6 Specifications
Electrical
12VDC 24VDC
Nominal operating voltage Supplied by the control panel
or by a regulated,
power‑limited 12VDC power
supply listed under UL864 or
UL1481
Supplied by a regulated,
power-limited 24V power
supply listed under UL864 or
UL1481
Alarm Current (maximum)
– One loop only 75 mA 168 mA
– Both loops 145 mA 300 mA
Standby Current (maximum)
– One loop only 12 mA 25 mA
– Both loops 24 mA 50 mA
Electrical - two‑wire powered loop ClassB
Current 12VDC 24VDC
– Alarm > 11.8mA > 24.1mA
– Detector 3mA 7mA
– Trouble < 3.5mA < 7.5mA
Loop wire resistance 50Ω 50Ω
Environmental
Environment Indoor, dry
Operating Temperature +32°F to +122°F (0°C to +50°C)
Relative Humidity 5% to 93% at +86°F (+30°C); non-condensing