Electronic Relays & Barriers

Programmable Electronic SAFE-PAK® Relay

Part Number: 54825
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Programmable Electronic SAFE-PAK ® Relay are designed for use with switches or sensors monitoring flow, pressure, level, etc. They render non-voltage-producing sensors intrinsically safe for operation in potentially hazardous areas. Operations such as normally open, normally closed or latching are programmed into these versatile SAFE-PAK units b the user during installation. Additional options available (consult factory) such as optically isolated operation, zero-crossover load switching, longer time delays, etc.


In Stock
CE ROHS Gems Compliant CSA


  • Designed for use with switches or sensors monitoring flow; pressure; level; etc.
  • They render non-voltage-producing sensors intrinsically safe for operation in potentially hazardous areas
  • Streamlined housing suited for group-mounting on a common earth-grounded plate for multiple installation
  • UL recognized; FM; CSA and evaluated by MSHA
Intrinsically Safe
Operating Voltage
95 to 125 VAC
Load Voltage
0 to 250 VAC
Load Current
0.5 amps at 20 VAC 0.05 amps at 200V AC or DC
Switch Operation
Turn-on Sensitivity
30K ohms
Turn-off Sensitivity
60K ohms
Minimum Temperature
Maximum Temperature

Gems Sensors Instructions, 54800 SAFE-PAK

Format .pdf
Size 629 KB

Gems Sensors Catalog, Programmable SAFE-PAK

Format .pdf
Size 725 KB
What does it mean to be "Intrinsically Safe?"

The term "intrinsically safe" refers to equipment and wiring which is incapable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture in its most easily ignited concentration. This is achieved by limiting the amount of power available to the electrical equipment in the hazardous area to a level below that which will ignite the gases present. To be certified "intrinsically safe," a device or circuit must be so designed that no two simultaneous failures can cause an explosion. In order to have a fire or explosion, fuel, oxygen and a source of ignition must be present. An intrinsically safe system assumes that fuel and oxygen are present in the atmosphere, but the system is designed such that the electrical energy or thermal energy of a particular instrument loop can never be great enough to cause ignition. Traditionally, protection from an explosion in hazardous environments has been accomplished either through the use of explosion proof conduits and enclosures (intended to contain an explosion), or via pressurization or purging (intended to isolate the explosive gas from the electrical equipment). Intrinsically safe apparatus cannot replace these methods in all applications, but in many cases can provide significant cost savings in installation and maintenance of the equipment in a hazardous area. The basic design of an intrinsic safety barrier uses Zener diodes to limit voltage, resistors to limit current and a fuse. Gems™ Intrinsically Safe Relays and Zener Barriers are approved devices designed to render any non-voltage producing sensor or switch intrinsically safe. For more information on hazardous locations as defined by the National Electrical Code (NEC) Handbook, click here.