Is there a connector kit supplied with the unit?
Yes, there is a connector kit supplied with the unit.
What are the commercial specifications?
These commercial 12, 20, 24 pole hermetically sealed bifurcated relays have gold plated relay contacts that are rated up to 2amp resistive load rating at 28vdc. Each relay is independently switched through their appropriate coil pins.
What is the pin out difference between the SR34 and the SR34-1
They are the same Pin for Pin, and package the same as the SR34. The SR34 model became obsolete and was replaced by the SR34-1 version.
What is the SR 34‑1 Switching Relay Unit?
The SR 34‑1 is a 12‑pole aircraft-grade switching relay module featuring three hermetically sealed bifurcated relays. It provides reliable signal routing in avionics systems.
What voltage does the SR 34‑1 operate on and what is its coil current?
It operates on standard 28 VDC, with coil current around 60 mA, and each contact rated for up to 2 A resistive load.
What are its physical dimensions and weight?
The unit measures approximately 3.92″ × 3.5″ × 0.82″ and weighs about 0.19 lb—compact and lightweight for panel installations.
Is the SR 34‑1 certified for aviation use?
It holds FAA-PMA approval pending status, allowing for certified installations once approved.
What are typical applications for the SR 34‑1?
Ideal for switching multiple navigation or avionics signal lines, especially when sharing GPS, HSI/CDI, or VOR/LOC sources in a system.
What are the benefits of choosing this relay module?
Built with sealed, gold-plated contacts that self-clean with operation, it offers long life (500k–2M operations), robustness at 2 A/30 VDC, and high reliability.
How do I install and maintain the SR 34‑1?
It installs into standard MARC‑70 series enclosures using Sandia’s wiring and pin‑out diagrams. Maintenance is minimal—check connections during routine inspections.
Where can I get technical support or purchase the unit?
The SR 34‑1 retails for approximately US $575 via Sandia Aerospace or authorized distributors like Aircraft Spruce. Technical documents and support are available on Sandia’s website.
Are there similar relay options available?
Yes—Sandia also offers SR 54‑1 (20‑pole) and SR 64‑1 (24‑pole) MARC‑70 relay units, sharing the same rugged construction and sealed relay design.
