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Have a live application? Use our United Electric Product Overview and Quick Selection Guide to configure the model and options for your requirement:

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ABLE are United Electric’s Exclusive Representative for Sales and Service in the UK and Ireland and can assist you and your customers in the following areas:

  • Application expertise
  • Our factory trained engineers offer after sales support, service and maintenance (contracts available)
  • Offer advanced United Electric pressure / temperature switch product training, either in-person or via video call.

Further to the above, ABLE can offer custom solutions based on your individual requirements. Email us now at [email protected]

United Electric 55 Series Temperature Switch

ABLE Instruments are United Electric’s Exclusive Representative for Sales and Service in the UK and Ireland, including the UE 55 Series, a rugged temperature electromechanical switch with external dial.

United Electric’s compact 55 bulb and capillary temperature switches are designed for use in food service appliances, oven control, and heat trace applications. They’re available in single or dual output versions, with a NEMA 4X enclosure or skeleton (open) construction, and with your choice of copper or stainless steel bulb and capillaries, in lengths from six feet (standard) to 50 feet (optional). The 55 Series temperature switch and control combine flexibility with compact size. They are cULus listed, cURus recognised, CE compliant.


  • Single or dual 15A SPDT switch output, wired normally open or normally closed
  • Copper or stainless-steel bulb and capillary
  • Adjustable temperature ranges from -130° to 650° F
  • NEMA 4X aluminium enclosure or skeleton construction, both with external dial for easy adjustment
  • Setpoint repeatability: ±1% adjustable range
  • Panel or surface mount for hassle-free installation
  • cULus listed, cURus recognised, CE compliant
  • Heat tracing models to protect pipes and vessels

Have a particular application / project in mind? We’d welcome a call on +44 (0) 1189 169 420, or email us now at [email protected]

55 Series Specifications:

Ambient Temperature Limits
-40 to 160°F (-40 to 71°C); set point typically shifts less than 1% of range for a 50°F (28°C) ambient temperature change
Set Point Repeatability
± 1% of adjustable range
Set point repeats after 15 G, 10 millisecond duration
Set point repeats after 2.5 G, 5-500 Hz
Enclosure Classification
Type E55 & E55A: Designed to meet enclosure type 4X requirements
Types E55S & E55AS: Skeleton, open frame construction, not applicable
Die cast aluminium, epoxy powder coated with stainless steel, gasketed adjustment cover (E55 and E55A)
Switch Output
One or two SPDT; dual switch may be separated up to 100% of range; switches may be wired “normally open” or “normally closed”
Electrical Rating*
15A, 125/250/480 VAC resistive. 22A, 480 VAC for E55-R25HT and E55-L24HT heat trace models. 2A, 24-30 VDC resistive; 1A, 24-30 VDC inductive. 0.5A, 125 VDC resistive. 0.03A, 125 VDC inductive
Electrical Connection
1/2” NPT (female) (E55 and E55A)
Types E55S, E55AS (skeleton): approximately 12 oz.; Types E55, E55A: approximately 1 lb.
Bulb / Capillary
Models E20BC – E23BC: 6 feet copper
Models E20BS – E23BS: 6 feet stainless steel
Model R25HT: 10 feet stainless steel
Model L24HT: stainless steel, Local sensor, no capillary, for ambient sensing
Temperature Fill
Non-toxic oil
Temperature Deadband
Typically 1% of range under laboratory conditions. For heat trace models (R25 HT, L24 HT), deadband may be as high as 5% of range under laboratory conditions (70°F circulating bath at rate of 1/2°F per minute change).
DC ratings are based on experience – Consult ABLE for further information
United States / Canada
E55(A) S Models
cULus Listed
cURus Recognised
UL 873, C22.2 no. 24, file #E10667
Low Voltage Directive (LVD) (2006/95/EC)
UEC compliant to LVD
Products rated lower than 50 VAC and 75 VDC are outside of the scope of the LVD
Purchase Product

Price: POA Contact 247ABLE