SSU-MR-821/T SPACE AGE

Product Overview

The Space Age Electronics SSU-MR-821/T is a single-position, high-density compact dual relay module engineered for low-current signal replication and control interfacing within HVAC, fire alarm, security, and lighting networks. Operating strictly on a 24VDC control loop, this specialized board houses two completely independent, miniature UL-recognized relays on a single-position card footprint. The 24VDC control input features strict reverse polarity protection and diode isolation to safeguard upstream panels. To facilitate quick field diagnostics, the board is populated with dual independent, high-intensity red LEDs that illuminate to show precisely which of the two localized relay coils is actively energized.

Key Features

• High-Density Dual SPDT Layout: Houses two entirely independent SPDT (Form C) dry miniature relays within a single-position card slot for massive space savings.
• Low-Current Signal Contact Rating: Features precise resistive load handling rated at 40mA at 115VAC or 2A at 30VDC (inductive load limits of 20mA at 115VAC / 1A at 30VDC).
• Power-Efficient 24VDC Coil: Draws a minimal nominal operating current of just 17mA per active position at a steady 24VDC input loop.
• Dual Diagnostic LEDs: Built with two dedicated, independent red LED indicators to provide instantaneous diagnostic tracking for both relay coils.
• Polarized and Diode Protected: Protects incoming loops against circuit degradation and reverse-field wire routing using integrated blocking diodes.
• Snap-Track Slide Mount: Supplied pre-configured with a 3.5-inch wide, low-profile plastic snap-track bracket and mounting screws for tool-less slider assembly.
• Modular Breakaway Fabrication: Built on a multi-position scored master substrate, letting system builders physically snap individual modules apart from a larger 8-position framework.