Advanced Search
Shopping Cart
Your Account
Contact Us

  Regent Controls Inc.
   1 Riverside Drive
   Ansonia, CT 06401
   Tel: 800-243-3141, 203-732-6200
   Fax: 203-732-6300

Untitled Document





  • Object or ground sensing with safe (low voltage, low current) sensing circuit.
  • Input can be contact, probe or solid-state sensing device.
  • Two output poles, independently convertible from normally-open to normally-closed.
  • Complete isolation between line, load, and logic terminals.
  • Compact size. DIN rail or panel mount.
  • LED status indicator for each output pole.
  • Regent’s 5 Year “No-Questions-Asked” Warranty.

Ideal for:

  • Part presence or absence detection
  • Liquid level control
  • Web break detection
  • Position control
  • Feed limit switch
  • Wire break detection
  • Intrinsic safety barrier interface relay

UL Recognized File number E57361
The WatchGuard120 senses the closing of external contacts or sensors. It is ideal for monitoring part presence and liquid levels in industrial environments.

An isolated internal power supply provides low voltage sensing to any contact, positioning electrode, limit switch, magnetic reed switch, float switch, proximity sensor, etc. The low-energy sensing circuit increases the life of reed switches and other contacts by eliminating inrush current at turn-on and arcing at turn-off.

Because it responds to a drop in resistance, the WatchGuard120 will respond to the closing of “dirty” contacts: a contact resistance below 25K ohms will energize the relay.

When the WatchGuard120 senses a closed contact, its two solid-state output switches energize. Field-proven AC output poles can control 120 VAC industrial loads such as solenoid valves and contactors, or serve as logic inputs to programmable controllers.




1. Either output pole can be used to provide a latching function.
2. Terminals L2 and/or 2 may be grounded.
3. For loads greater than 1 amp, do not parallel solid-state switches. The current will not divide equally and may result in damage.
4. On removal of L1,L2 voltage, both A,B and C,D open.
5. Up to 5 output switches (A,B and C,D) from several WatchGuard120’s may be used in series.



Line Input (L1,L2 terminals)

120 VAC +/- 20%, 50/60 Hz

Sensing Input (1,2 terminals)

Open-circuit voltage (typical)

Closed-circuit current

Resistance Sensitivity (typical)


12 VDC

less than 1 mA

Pull in below 25K ohms. Drop out above 50K ohms

Load Switch (A,B and C,D terminals)


Off-state leakage

On-state voltage drop

Minimum load current

Response Times

Recommended load fuse


120 VAC +/- 20%, 1A continuous, 5A inrush; resistive or inductive

less than 2 mA at 65C

1 VAC typical at rated current

15 mA

turn-on: <1 msec turn-off: 1-9 msec

Littelfuse 322002


0 to 65C (32 to 149F)

    Product Name+   Price   Buy Now 
 WatchGuard120   $210.00 
  Buy Now  
Displaying 1 to 1 (of 1 products) Result Pages:  1