Description 

The Honeywell Silent Knight SD500‑ARM is an addressable relay module designed for Farenhyt and IntelliKnight fire alarm control panels. It provides two Form C dry contacts rated at 2 A @ 30 V DC or 0.6 A @ 120 VAC, enabling control of devices such as elevator recall, door holders, fans, and auxiliary notifications.

 

 

Technical Specifications 

Condition	New/Never Used Surplus
Brand	Honeywell
Category	Fire Safety
Part Number	SD500-ARM
Subcategory	Fire Alarm Control
Programming Method	DIP Switch Programming for Fast Installation
Relay Contacts	Two Sets of Form C Dry Contacts
Mounting Type	4-Square Electrical Box
Operating Voltage	24 VDC
SLC Standby/Alarm Current	0.55 mA
SLC Loop Resistance	50 Ohms
Operating Temperature Range	32° – 120°F (0° – 49°C)
Relay Ratings (Resistive)	30 VDC @ 2.0 A
Relay Ratings (Inductive)	30 VDC @ 1.0 A (0.6 PF)
Relay Ratings (Pilot Duty)	30 VDC @ 0.6 A (0.35 PF), 120 VDC @ 0.6 A (0.35 PF)
Weight	0.27 lbs

  

 

Information About SD500-ARM

The SD500-ARMc is part of Honeywell’s Silent Knight series of addressable modules, engineered to provide reliable remote control of auxiliary devices in addressable fire alarm systems. This model features two Form C dry-contact relays, DIP switch programming for simplified setup, and is addressable via the system’s SLC loop. Designed to mount inside a standard 4-square electrical box, the SD500-ARMc offers compact, flexible integration for fire protection systems. With ultra-low standby current and a broad operating temperature range, it’s ideal for applications requiring elevator control, fan shutdown, door holders, and auxiliary signaling.

Key Features:

• Dual Form C Relay Outputs: Provides two independently configurable dry-contact outputs for activation of external devices like strobes, fans, or magnetic door holders.
• Addressable via SLC Loop: Individually addressable on the system loop, allowing precise control and monitoring from compatible Silent Knight or Farenhyt fire panels.
• DIP Switch Programming: Simple addressing via DIP switches ensures quick, accurate installation with no special tools or programming interfaces required.
• Low Power Consumption: Draws only 0.55 mA in both standby and alarm modes, minimizing current load on the SLC and maximizing loop capacity.
• Relay Ratings: Supports multiple load types including:
  • 30 VDC @ 2.0 A (resistive)
  • 30 VDC @ 1.0 A (0.6 PF inductive)
  • 120 VAC @ 0.6 A (0.35 PF pilot duty)
• Standard Box Mounting: Fits conveniently in a standard 4-inch square electrical box, enabling streamlined, code-compliant installation.
• LED Status Indicator: Visible through the cover plate for easy diagnostics and confirmation of module polling status.
• Wide Environmental Range: Operates from 32°F to 120°F (0°C to 49°C), making it suitable for use in a variety of indoor environments.

The SD500-ARMc offers flexible relay control with a simple, compact design and reliable addressable functionality. Whether you're activating fan shutdown, elevator recall, or auxiliary notification appliances, this module provides dependable operation with straightforward installation. Though now discontinued, the SD500-ARMc remains a trusted solution in many legacy Silent Knight fire alarm systems.