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Fire Alarm System (EN54)

Short circuit isolator

A9057T

Product features

LPCB & CPR approval

In the event of a short circuit it isolates faulty parts of the loop.

Automatically resetting once the fault has been cleared.

LED lights indicate status.

Read more detail
  • A9057T loop isolator (hereinafter referred to as A9057T), mainly used to isolate a portion of a short circuit on the bus, other devices on the bus to ensure normal operation. Upon elimination of the short circuit fault, A9057T can be isolated out their own part back into the system. It is worth noting: A9057T using the bus to facilitate the determination of the location of a short circuit.

Technical Parameters:


Executive StandardEN54-17
Operating voltage24VDC (pulse modulation) loop voltage
IndicatorYellow ( blinks when polling, keeps on when acting.)
Operating environmentIndoors, Temperature: -10 ℃ ~ +40 ℃, Relative humidity: ≤ 95%, non-condensing
Dimension86mm × 86mm × 40mm
Material and colorABS, ivory
Weightabout 122g (with base)
Mounting hole distance60.5mm




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