In loop type fire alarm system, it often occurs that partial short circuit of loop affects the whole system. C-9504E Base Mount Short Circuit Isolator can isolate the shorted circuit from the whole system to ensure normal operation of the remaining parts and locate the failed part by illuminating a yellow indicator. When the short circuit fault is cleared, the shorted part will be restored. The isolator is applicable to all loop type fire alarm systems, either Class A or Class B loop.