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381-BT GuardSwitch Series

Safety Switch


The 381-BT Series DPST safety interlock switch is designed for use with safety monitored relays or monitored circuits. To achieve the optimum Series 300 defeat resistant feature of the 381-BT, both the switch circuit (Circuit 1) and the tamper circuit (Circuit 2) must be connected.


  • Requiring Highly Defeat Resistant Switches

  • Meets ANSI, Semi S2 & European Safety Standard for the Highest Machine Risk Category 4 when used with the INT Safety Relay

  • Packaging Machinery

  • Pharmaceutical Equipment

  • Semiconductor Equipment

  • Machine Tool Equipment

381-BT GuardSwitch Series

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Catalog Numbers

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Catalog Number

DPST: 1 N.O. / 1 N.C. 1/2 in. NPT, Left Exit
Dark Grey
See data sheet


DPST: 1 N.O. / 1 N.C. 1/2 in. NPT, Right Exit
Dark Grey
See data sheet




Agency Approvals

cULus Recognized (E122942)
CSA Certified (LR89176)
NEMA Ratings:  1, 2, 5
Protection Class:  IP64


Enclosure:   Coated Aluminum

Temperature Range:   -40F to 180F (-40C to 80C)

Environmental:   Hermetically sealed contact switch encapsulated in polyurethane

Response time (individual circuits):   1 msec

Life cycles:   100,000 under full load;  Up to 200,000,000 under dry circuit

Conduit Connection:   1/2 " Threaded NPT


Installation Instructions