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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.

United Electric 400 Series Differential Pressure / Temperature Switch

ABLE Instruments are United Electric’s Exclusive Representative for Sales and Service in the UK and Ireland, including the 400 Series. Simple to install and operate the UE 400 series provides end-users multi-output alarm, safety and emergency shutdown functionality. It carries global agency certification and as an electromechanical switch, it can safely operate independently of the control system and switch reliably when called upon, free from potential communication errors or cyber concerns.

The United Electric 400 Series is a versatile family of vacuum, pressure, differential pressure and temperature switches for applications that require single or multiple switching capabilities. Dual and triple switch versions provide multi-output for alarm and shutdown, pre-alarm and alarm, high/low limit or level staging functions. A wide variety of microswitch and process connection options, along with a weather-tight enclosure, make the UE 400 Series an ideal choice for most ordinary location applications. Its global use is assured with approvals and certifications to agency standards. Widely used throughout the process industries, the United Electric 400 Series provides threshold protection and control for many critical functions. Typical installations are found in industrial gas production, energy generation including pumps, turbines and compressors, pulp and paper, and water and wastewater treatment.


  • Low and/or high limit alarm and safety shutdown via one, two or three independent switches, separated up to 100% of range
  • Quick and easy installation with ample access to wiring compartment and simple set point adjustment using reference dial or calibrated gauge
  • Application versatility achieved through a variety of ranges, microswitches, sensors and process connections
  • Replaces a switch and a gauge in differential pressure applications when using optional visual indication
  • 1, 2 & 3 switch outputs
  • Optional ATEX or EAC intrinsic safety compliance
  • Wide variety of pressure sensors and materials

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]

Typical installations are found in industrial gas production, energy generation including asset control of pumps, turbines and compressors, pulp and paper, and water and wastewater treatment.

400 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
± 2% of full scale range
Models 126-376, 520-535, 540-547, 570-572, S126B-S164B: ± 2% of full scale range
Models 440-457, 550-559: ± 1% of full scale range
Models 610-614: ± 3% of full scale range
Set point repeats after 15 G, 10 millisecond duration
Set point repeats after 2.5 G, 5-500 Hz
Die cast aluminium, epoxy powder coated, gasketed, captive cover screws
Enclosure Classification
Designed to meet enclosure type 4X requirements
Switch Output
One, two or three SPDT switches, may be separated up to 100% of range, except models 521-524, 531-534: 50%; models 520, 525, 530, 535, 570-572: 30%; switches may be wired “normally open” or “normally closed”
Electrical Rating
15 A 125/250/480 VAC resistive. Electrical switches have limited DC capabilities; at 24-30 VDC, 2A resistive and 1A inductive; at 125 VDC, 0.5A resistive and 0.03A inductive. Consult factory for additional information.
Approx. 3 to 7.5 lbs.; varies with model
Electrical Connection
One 3/4” NPT and two 7/8” diameter knockouts
Pressure Connection
All models 1/4” NPT (female) except models S126B-S164B, 520-535: 1/2” NPT (female); models 540-547: 1/8″ NPT (female)
Temperature Assembly
‘E’ types use the same assemblies as ‘F’ types, however, range spans are limited due to use of reference dials
Bulb and capillary: 6 feet 304 stainless steel
Immersion stem: models 120 &121: nickel-plated brass; optional 316L v stainless steel available
Temperature Models: Non-toxic oil filled
Temperature Deadband
Type F typically 1% and type E, B & C typically 2% of range under laboratory conditions (70°F ambient circulating bath at rate of 1/2°F per minute change)
Differential Pressure Indicator (Option M210)
Differential pressure indication available J400K, J402K models 147-S157B; accuracy approximately 1-1⁄2% mid 50% of range, 3% at ends; window is plexiglass and gasketed; indicator may be field adjusted for approximately ±1% accuracy at any set point within range
United States / Canada
Type 400 & 402
UL listed, cUL Certified

Pressure: UL 508; CSA C22.2 No. 14, file # E42272
Temperature: UL 873; CSA C22.2 No. 24, file # E10667
Type 403
UL Recognised, cUL Recognised
Pressure: UL 508; CSA C22.2 No. 14, file # E42272
Temperature: UL 873; CSA C22.2 No. 24, file # E10667
All Types
FM Approved
Pressure: Class 3510
Temperature: Class 3545
ATEX Directive (94/9/EC)
II 1 G EEx ia IIC T6 (OPTIONAL – code M405)
Tamb = -50°C to +60°C
UL International DEMKO A/S (N.B.# 0539)
Certificate # DEMKO 03 ATEX 0335063
EN 50014, 50020 & 50284
Low Voltage Directive (LVD) (73/23/EC & 93/68/EEC)
Compliant to LVD
Products rated lower than 50 VAC and 75 VDC are outside of the scope of the LVD
Pressure Equipment Directive (PED) (97/23/EC)
Compliant to PED
Products rated below 7.5 PSI are outside the scope of PED
Gosgortechnadzor Permit (OPTIONAL – code M406)
Tamb = -50˚C to +60˚C
NANIO CCVE Certification Center
Certificate # ROSS US.GB05.Bo2933
GOST R 51330.0, 51330.1, 51330.10 & 51330.14
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Price: POA Contact 247ABLE