1746-HSRV A-B  Interface Module

Switched Neutral Module (not field-mountable) The switched neutral module opens the neutral line of the circuit when the protected poles are tripped. This module should be used as a safety measure (required by some standards) when protecting networks with a grounded neutral system. The switched neutral pole closes before the adjacent protected pole (i.e., early make). The switched neutral module also provides instantaneous/magnetic trip, manual actuation is through the linked handles, and should always be mounted on the right side of the protected poles. These modules are not field installable.  To order the proper device, you need to know the: • maximum rated current of equipment to be protected, • system phase of one, two, or three, • maximum startup (inrush) current, and • accessories that are required.

The standard tripping characteristic for Bulletin 1492-SP is Type C. Type C has a magnetic trip activated at 5…10 times the rated current of the circuit breaker. The reference temperature for the thermal tripping characteristics is 30 °C. The Type C characteristic will suit most applications. Use the following steps to determine the current rating for the breaker. 1. Take the rated current of the equipment. For example, 10 A. 2. Take the ambient temperature of the 1492-SP location (e.g., 50 °C (122 °F)). 3. Refer to the table below, which rerates the 1492-SP current for the given ambient temperature. Influence of the ambient temperature on the thermal tripping characteristic.

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