NOHMI BOSAI
NOHMI BOSAI FQIU004-SCI Short Circuit Isolator
Manufacturer: NOHMI BOSAI
Model: FQIU004-SCI
Features of FQIU004-SCI
- One simple LED for status indication
- Self-restoring LED indication
- Downsized unit
- Easy installation
- UL listed
Description
- 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.
Specifications of FQIU004-SCI
| 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 |
Installation
Figure 1: Installation into the compatible electrical box
Wiring Diagram
Figure 2： NFPA Class B (Style 4) Wiring Configuration
Figure 3: NFPA Class A (Style 7) Wiring Configuration 
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