Watts Tekmar Switching Relay 301P

Switching Relay 301P

The Switching Relay 301P is a crucial component that links to a single thermostat, facilitating the operation of a circulator and boiler to deliver heating within a hydronic heating system. Notably, the 301P offers optional exercising to prevent circulator seizure during periods of inactivity, along with an optional post-purge operation to optimize energy conservation.

Key Features:

  • Compatible with all low voltage thermostats and supports pump exercising
  • Includes post-purge functionality and features an LED indicator for power and zone status
  • Equipped with top, bottom, and back conduit knockouts for versatile installation options
  • Incorporates a fuse to safeguard the pump, with a spare fuse included for convenience
  • Utilizes a 20 VA transformer for efficient power distribution
  • Enhanced safety measures with a thermal circuit breaker to protect the transformer
  • Features a hinged cover for easy access and maintenance
  • CSA approved for quality assurance
  • Backed by a 3-year warranty for peace of mind


Agency Approvals CSA C US
Ambient Conditions Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), RH less than or equal to 90 percent non-condensing
Control Load 7.5 VA at 115 V (ac)
Control Type Microprocessor control, this is not a safety (limit) control
Dimensions 6-11/16″ H x 4-15/16″ W x 2-7/16″ D (169 x 123 x 62 mm)
Enclosure Material Cover: ABS plastic, Base: galvanized steel
Enclosure NEMA Rating NEMA 1
Power Supply 115 V (ac) plus / minus 10 percent, 60 Hz, 5 A
Pump Relay 230 V (ac), 5 A, 1/3 hp