NOHMI BOSAI FQIU004-SCI Short Circuit Isolator

Manufacturer: NOHMI BOSAI
Model: FQIU004-SCI

Features of FQIU004-SCI

The Short Circuit Isolator (FQIU004-SCI) provides additional reliability for fire protection systems by isolating segments of the Signaling Line Circuit (SLC) where short circuits occur. This function ensures the rest of the loop can continue monitoring and operating. The FQIU004-SCI features a red LED to indicate its status. In normal conditions, the LED stays deactivated. Once a short circuit happens, the FQIU004-SCI immediately cuts off the affected circuit and activates the LED. When the issue is resolved, the isolator restores normal function and turns off the LED.

No.	Item	Specification
1	Rated voltage range of SLC input power (S+, S-)	22.0 to 24.0V
2	Maximum SLC 24 VDC standby current (S+, S-)	250µA
3	Maximum SLC 24 VDC alarm current (S+, S-)	1.80mA
4	Internal Resistance	0.1Ω
5	Wiring resistance or wiring after a SCI in Class B (style 4)	10Ω
6	Wiring resistance or wiring between a SCI and another SCI in Class A (style 6 and 7)	10Ω
7	Maximum number of addressable devices connected to a SCI	50 units
8	Operating temperature range	0°C to 49°C (32°F to 120°F)
9	Operating humidity range	0 to 93% (non-condensing)
10	Dimensions	106mm (4.17 inches) (H) x 106mm (4.17 inches) (W) x 29mm (1.14 inch) (D)
11	Applicable electrical box for installation	North American 64mm (2-1/2 inches) deep 2-gang box Standard 4 inches square box 38mm (1-1/2 inch) deep box