- Resources & Support
- Where to Buy
The Murphy TR Series, Transformer Relay Assemblies are electric motor controllers. Models are available for emergency shutdown, start and stop only, start and stop with emergency shutdown, and combinations of the above models with time delay.
All TR Series internal control circuits are completely prewired and relays are plug in type to facilitate field servicing.
NEMA 1 enclosure is standard on all TR Series models. NEMA 3 weatherproof enclosure, and “LC” Less Case versions are optional.
Murphy SWICHGAGE® instruments for pressure, temperature, level etc., can be used with the TR’s for semiautomatic or totally unattended operation and control of your electric motor powered equipment.
A set of normally open, dry relay contacts controlled by a 24 VAC relay coil, controls the magnetic motor starter holding coil up to 480 volts. The high voltage contacts are completely isolated from the low voltage control to help reduce electrical hazards.
The TR Series transformer relay assemblies are ideal for controlling a variety of electric motor driven applications. They are recommended for use on salt water disposal systems, waterflood systems, and many others. A Model TR-1762 used in conjunction with a model OPLHC Tank Level Controller, and an OPLC Series discharge pressure can completely automate a salt water disposal pump.
Transformer: Primary (power supply) with triple taps for 120/240/480 VAC. 50/60 Hz.
Secondary (control supply) 24 VAC.
Power Rating: 25 VA.
High Voltage rated at 30 A, 600 V.
Low Voltage rated at 20 A, 300 V.
Control Relays: Plug-in, 120 V, 10 A contact rating.
Power (holding): 10 A, 480 VAC, SPST.
Control (auxiliary): 480 VAC, 690 VA pilot duty.
Conduit: Top: 3/4 in. hub; Bottom 1/2 in. hole.
Approximated Shipping Dimensions:
NEMA 1; NEMA 3; and “LC” Less Case: 15 x 15 x 7 in. (381 x 381 x 178 mm).
Approximated Shipping Weight:
NEMA 1: 18 lb. (8.16 kg.).
NEMA 3: 22 lb. (10 kg.).
“LC” Less Case: 14 lb. (6.35 kg.).
For more information about this product, you can download the related literature here: