The HM201-I can be installed in a single gang junction box directly behind the monitored unit. Its small size and light weight allow it to be installed without rigid mounting. The module is intended for use in addressable,

2-wire systems.

The HM201-I is an automatic switch that opens when the line voltage drops below four volts.

Isolator

The HM201-I should be spaced between groups of sensors or modules in a loop to protect the rest of the loop. If a short occurs between any two isolators, then both isolators immediately switch to an open circuit state

and isolate the devices between them. The remaining units on the loop continue to fully operate. The number of devices that can be installed between isolator modules varies depending on the device type

(Recommend no more thances).