Dry Contacts, Dry Contact Configuration

Operation

Figure 8: Rear of Diagnostic Circuit Board

Surge counter
reset switch
(white)
RJ45	Dry
Connectors	contacts

Dry Contacts

The SurgeArrest® series SPDs come standard with dry contacts. The connection for the dry contacts is located on the back of the diagnostic display panel (lower right corner). The dry contacts are 3-position, Form “C” type with Normally Open, Normally Closed and Common connections. In the unpowered state the contact is closed between terminals NC and COM. This is also the alarm condition. The opposite state, closed between terminals NO and COM, indicates that power is on to the unit and that no alarm condition exists (See Table 5). These contacts can be used for remote indication of the SPD’s operating status to a computer interface board or emergency management system. Also, these contacts are designed to work with the SPD remote monitor option described below.

The dry contacts are designed for a maximum voltage of 24 Vdc / 24 Vac and a maximum current of 2 A. Higher energy applications may require additional relay implementation outside the SPD. Damage to the SPD’s relay caused by use with energy levels in excess of those discussed in this instruction bulletin are not covered by warranty. For application questions, contact APC Technical Support at 1-800-800-4272.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

•Use 600 Vac rated dry contact wiring.

•Dry contact wiring must have less than 1/16 in. (1.6 mm) exposed wire from the dry contact block.

•Maintain at least 1.0 in. (25 mm) separation between dry contact wiring and the power wiring in the enclosure.

Failure to follow these instructions will result in death or serious injury.

Care must be taken in installing the dry contact wiring because the terminals are on a moving door. Avoid the door hinge, any switches, and the high voltage areas of the enclosure when routing the wiring. To avoid the door hinge, tie wrap any dry contact wiring to the existing cable harness which crosses the hinge. Once the dry contact wiring is secured on a non-moving point of the enclosure, it is the user’s responsibility to maintain at least 1.0 in. (25 mm) separation between 600 Vac rated dry contact wiring and the power wiring in the enclosure.

Table 5: Dry Contact Configuration

Alarm Contact Terminals	Contact State with Power Removed

NC	Normally closed

COM	Common

NO	Normally open

18	Installation and Operation Manual

PML3XS-B, PMJ3XS-B, PMH3XS-B, PMF3XS-B, PMP3XS-B specifications

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