Simplex 2081-9044 Circuit Protection. Electrical transients caused by lightning or by disturbances on high voltage power lines can cause damage to low voltage fire alarm circuits. Proper application of 2081-9044 Overvoltage Protectors can minimize the energy from those electrical transients to a level that can be safely handled by the circuits requiring protection. This protection is most effective when placed at the locations where the circuits leave and enter buildings. The 2081-9044 Overvoltage Protector provides multiple stages of protection against electrical transients. The small package size allows it to be easily mounted at the location that achieves maximum protection.