PRESSURE SWITCH H100-376 United Electric, USA

Overview

The United Electric H100-376 pressure switch is an industrial unit offering a wider adjustable set point range of 25 to 500 psi, making it well suited to higher-pressure alarm and control duties. With a dead band of 1.5 to 8 psi, the switch delivers dependable, repeatable operation for process protection applications.

Built by United Electric Controls in the USA, the H100-376 shares the proven H100 series construction: a robust sensing element, precision snap-action switching, and a Type 4X die-cast aluminium enclosure designed for demanding industrial and outdoor environments.

Engineering & Design

The switch translates process pressure through a diaphragm piston element into a positive snap-action contact transfer, providing clean switching without contact chatter. The epoxy powder coated aluminium housing with gasketed cover and captive screws protects the internal mechanism from moisture and corrosion in accordance with Type 4X requirements.

The 1/4 inch NPT female process connection suits standard instrumentation piping, while the electrical rating of 15A at 125/250/480 VAC resistive enables direct control of industrial circuits. Operating from -40°C to 71°C, the switch is fully suitable for Gulf climate conditions.

Key Features

• Adjustable set point range 25 to 500 psi
• Dead band 1.5 to 8 psi
• Max over range pressure 500 psi, proof pressure 800 psi
• 316L stainless steel wetted parts
• 1/4 inch NPT female pressure connection
• Type 4X certified enclosure with captive cover screws
• 15A @ 125/250/480 VAC resistive electrical rating
• Ambient temperature -40°C to 71°C
• USA manufactured by United Electric Controls

Applications

• High-pressure alarm and shutdown duties
• Compressor discharge pressure protection
• Boiler and steam system pressure control
• Pipeline pressure monitoring
• Hydraulic and pneumatic system protection
• Industrial process pressure switching

Specifications

In higher-pressure services, the margin between normal operating pressure and the trip point narrows, and switch reliability becomes critical. The United Electric H100-376 pressure switch addresses this with a 25 to 500 psi adjustable range that covers most medium-to-high pressure protection duties in industrial plants.

Where higher set points are required, the United Electric H100-376 pressure switch provides the range, and Seven Star LLC supplies the United Electric H100-376 pressure switch with full specification support.

The H100-376 variant uses the same enclosure and mounting dimensions as the other H100 switches, which simplifies the replacement of an existing unit without panel modifications. The process connection orientation is selected during the installation to keep the drain port downward, and the switch is protected from the line vibration with the rigid mounting. The certified pressure range of the unit is printed on the nameplate for the maintenance reference.

Why Seven Star LLC

Seven Star LLC supplies the United Electric H100-376 pressure switch with full technical documentation and responsive commercial support. We help plant engineers confirm set point ranges, electrical ratings, and spares for their pressure protection systems, across the Gulf region.

Seven Star LLC supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation.

Performance Characteristics

The H100-376 provides a dead band of 1.5 to 8 psi, allowing stable operation even when process pressure fluctuates around the set point. The 800 psi proof pressure provides protection during commissioning and upset conditions, while the 316L stainless steel wetted parts resist corrosion from process fluids.

The die-cast aluminium enclosure with gasketed cover and captive screws maintains the Type 4X rating through years of outdoor service, and the generous electrical rating allows direct connection of control circuits without intermediate relays.

Request a Quote for PRESSURE SWITCH H100-376 United Electric, USA

For the United Electric H100-376 pressure switch, H100 series pressure switch or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your network, interface and power requirements, and our specialists will respond with a detailed commercial proposal and the official United documentation.

Selecting and Matching the Switch

The model number on the nameplate is the most reliable way to order a like-for-like replacement, because the H100 family covers many ranges and options. When comparing, confirm that the normal operating pressure sits comfortably inside the 25 to 500 psi adjustable range, and that the set point is not placed close to either end of that range, where repeatability is generally weaker. Also check that the dead band suits the process: a narrow dead band gives precise switching but can cause cycling on a fluctuating pressure.

Confirm the process connection, wetted material, enclosure requirements and electrical load with the existing installation. For a hazardous area, check the area classification separately, since a Type 4X enclosure is a weatherproof and corrosion rating, not an explosion-protection rating.

Installation and Set Point Adjustment

• Mount the switch on a stable support, not hanging on the impulse line, and fit an isolation valve and a test point where possible.
• On pulsating services such as compressor discharge, add a snubber to protect the sensing element and reduce contact chatter.
• Use sealing compound or tape suitable for the process on the NPT thread, and do not overtighten against the housing.
• Adjust the set point using a calibrated pressure source, approaching from the direction the process will move, then record the actual switching and reset values.
• Close the cover properly with its gasket and captive screws to keep the Type 4X protection.

Testing and Troubleshooting

Include the switch in the plant’s periodic function testing: apply pressure from a test pump, record the trip and reset points and compare them with the setting sheet. If the switch drifts, chatters or fails to reset, check for blocked impulse lines, pressure pulsation, moisture inside the enclosure and loose wiring before replacing the unit.

Oman and GCC Service

High-pressure protection on compressors, boilers, pipelines and hydraulic systems is common in Oman’s oil, gas and utility sectors. The United Electric H100-376 pressure switch is suited to outdoor installation in these conditions, provided cable entries are sealed and the switch is shaded where practical.

Supply from Seven Star LLC

Seven Star LLC supplies United Electric Controls pressure and temperature switches to customers across Oman and the GCC. Send the full model number from your nameplate and we will confirm the match and delivery time.

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