Product Overview
The SK-ISO is a SLC loop line isolator module designed for use with Honeywell Silent Knight Series fire alarm control panels (FACPs). It functions as an automatic switch that opens when the line voltage on the signaling line circuit (SLC) loop drops below four volts. Isolator modules are intended to be spaced between groups of sensors or modules within a loop to protect the rest of the loop from short circuits. If a short occurs between any two isolators, both immediately switch to an open circuit state, isolating the devices between them, while the remaining units on the SLC loop continue to operate. A maximum of 25 isolator modules can be used per group.
Visual Description: The module is compact, featuring terminals labeled for power (PWR), loop (TB A (+), LOOP, TB A (-)), and signaling line circuit (SLC (+) T2, SLC (-) T1). It is marked with "SK-ISO.", "SK-CONTROL MODEL NO.", and "Honeywell".
Installation
The SK-ISO. mounts directly into a 4-inch square electrical box. The electrical box must have a minimum depth of 2-1/8 inches. A surface mount electrical box, System Sensor® PN SMB500, is available from Honeywell.
Compatibility
The SK-ISO. is compatible with the following Silent Knight Series FACPs:
- 6808U
- 6820U
- 6820UEVS
Features & Benefits
- Isolates short circuits on an SLC loop.
- Protects modules on the SLC loop, allowing other devices to continue operating.
- Features a panel-controlled status LED that flashes green in the normal state and displays solid red in alarm.
- Designed for standard 4-inch electrical box mounting.
- Equipped with SEMS screws for simplified wiring.
Agency Listing and Approval
- UL Listed
- FM Approved
Technical Specifications
Physical
| Dimensions | 4.5" H x 4" W x 0.25" D (11.4 x 10.2 x 0.6cm) |
| Shipping Weight | 6.3oz (196g with bracket) |
Electrical Ratings
| Operating Voltage | 15-32 VDC |
| Standby Current | 450 µA max (not isolating; relay closed) |
| Maximum Current | 17mA (device in isolation) |
| Fault Detection Delay | 250ms min |
Environmental
| Operating Temperature | 32°-120°F (0°C – 49°C) |
| Humidity | 10 to 93% non-condensing |
Ordering Information
| SK-ISO. | Line Isolator Module |
Accessories
| SMB500 | 4" Square Surface Mount Electrical Box |
Additional Information
For a complete listing of all compliance approvals and certifications, please visit https://buildings.honeywell.com.
Silent Knight™ is a trademark of Honeywell International, Inc. This document is not intended to be used for installation purposes. Honeywell strives to keep product information up-to-date and accurate but cannot cover all specific applications or anticipate all requirements. All specifications are subject to change without notice.
For Technical Support, please call 0008000502167.
For more information:
Website: https://honeywellbuildings.in
Tel: +91 124 4975000
Email: BuildingAutomation.FireIndia@Honeywell.com
Honeywell Building Automation
Unitech Trade Center, 5th Floor, Sector-43,
Block C, Sushant Lok Phase - I,
Gurgaon - 122 002, Haryana, India
Website: https://www.honeywellbuildings.in/
© 2025 Honeywell International Inc. All specifications are subject to change without notice.
