27A1D0 - 

Series 27 is UL approved for use in Class I, Groups A, B, C, D; Class II, Groups E, F, G; and Class III hazardous locations. SPDT output contacts. UL Pilot Duty rated.

Features:

Cannot Ignite Flammable Materials

Solid State Reliability

Up to 470K Ohm/cm Sensitivity (Series 17)

Internal Surge Suppression

SPST Contacts (Series 17)

SPDT Contacts (Series 27)

Can Be Used for Single Level or Differential Service