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The Powergenex SAR Snap Acting Relay switches to an auxiliary air source when air pressure from the primary port falls below a predetermined level. This keeps the valve at its last position after loss of air.

As a fail-safe device with a fail-last function, it increases dependability of process control systems. It also accurately detects differential pressure and promptly provides snap-action.

This compact and lightweight snap acting relay has a rugged housing for tough working conditions. It comes in two types: single-acting (SAR-S) and double-acting (SAR-D).

Technical specifications




SAR-S (Single acting)
SAR-D (Double acting)

Proof pressure

Maximum 10 bar

Signal pressure

1.4–7 bar

Line pressure

Maximum 7 bar

Flow capacity (Cv)


Operating temperature

-20 to +70°C


¼” NPT

Material specifications


Aluminium die-cast
316 stainless steel

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