55025 Littelfuse 55025 Sealed Toggle Switch (IP67, SPST, 25A)

Overview, Specifications & Applications of the Littelfuse 55025 Toggle Switch

The Littelfuse 55025 is a sealed, heavy-duty toggle switch designed for reliable control in vehicles and equipment that operate in dirt, moisture, vibration, and temperature extremes. As part of Littelfuse’s sealed toggle family, it brings the “install and forget” durability that OEMs and maintainers want for dashboards, panels, and enclosures exposed to the elements.

At its core, the 55025 is an SPST On-Off switch with a robust electrical rating of 25 A at 12 VDC and 15 A at 24 VDC, making it an excellent fit for direct switching of lamps, small motors, pumps, heaters, and other accessory loads commonly found in mobile and off-road systems. The switch ships with two blunt-cut 14 AWG leads for quick termination and strain-relieved wiring in harnesses or sealed junctions—no spade tabs to corrode, loosen, or collect debris. The actuator is a standard toggle handle measuring 11/16 in (≈17.46 mm), giving operators positive tactile feedback even when wearing gloves. The black plastic housing mounts through a standard 15/32 in (≈11.90 mm) panel hole with a nickel-plated brass face nut, so it drops neatly into existing vehicle and machine panels. Rated ingress protection to IP67, the 55025 resists dust ingress and survives temporary immersion, supported by an O-ring under the actuator and an epoxy-sealed connection interface. Operating temperature spans –40 °C to +85 °C, covering cold starts in winter and enclosed-cab heat in summer.

Beyond the base On-Off function, the same mechanical platform underpins several related part numbers, including momentary and SPDT options and a DPST sibling (55026). This shared architecture simplifies standardization across a vehicle line or machine family—engineers can keep the same panel cutouts, nuts, and operator feel while tailoring the switch function to each circuit.

For engineers, the 55025 is a practical choice when you need:

• A sealed, glove-friendly toggle with straightforward panel integration.

• Direct 12/24 VDC load switching at meaningful currents without adding relays for every circuit.

• Proven environmental robustness for construction, agriculture, material handling, and commercial vehicles.

Specifications

The following table consolidates the key published parameters and ordering guidance for the 55025 sealed toggle switch. Values are taken from Littelfuse’s product datasheet.

Data source: Littelfuse 55025 Sealed Toggle Switch datasheet.

Applications

Construction Equipment
Bulldozers, excavators, skid steers, trenchers, and compactors all live in mud, dust, and wash-down cycles. The 55025’s IP67 sealing, corrosion-resistant silver contacts, and sturdy face-nut mounting let it withstand grit and vibration on open cabs and exterior control pods. Typical loads include work lights, beacon strobes, hydraulic solenoids (through appropriate protection), cooling fans, and auxiliary 12/24 V accessories.

Agricultural Machinery
From tractors and sprayers to combines and utility vehicles, agricultural platforms see temperature extremes and frequent hose-downs. The sealed actuator and epoxy-potted lead interface resist moisture ingress, while the glove-friendly handle provides positive switching feedback from the cab. Common uses: lighting circuits, pump enable, auger drives (control signal), and cab power distribution.

Material Handling & Warehousing
Forklifts, pallet stackers, and lift tables benefit from a simple, rugged operator control for auxiliary functions—horns, lights, alarms, or power-enable for DC/DC converters. The 55025’s 14 AWG lead terminations simplify integration into harnesses and sealed junction boxes, speeding assembly while maintaining environmental integrity.

Commercial & Specialty Vehicles
Service trucks, municipal vehicles, snowplows, forestry rigs, and emergency upfits use the 55025 for lightbars, work lamps, PTO enable circuits (via interlocks), cabin heaters, and accessory power. The standard 15/32-inch panel hole and nickel-plated face nut make field retrofits and panel service straightforward across a wide range of body builders.

Why engineers choose the 55025

1) Real-world sealing without complexity
Instead of relying solely on panel gaskets or boots, the 55025 integrates sealing at two critical ingress paths: an O-ring at the actuator and an epoxy-sealed connection interface around the leads. This design helps the switch maintain IP67 performance even after repeated wash-downs or dust exposure, while preserving the tactile feel of a metal toggle.

2) Strong DC ratings for direct switching
With 25 A at 12 VDC (and 15 A at 24 VDC), many loads can be switched directly. For lamp loads or motors with inrush, designers can still choose to add protective relays or inrush-limiting components, but the 55025 gives the headroom needed for common auxiliary circuits in 12/24 V systems.

3) Easy harness integration and serviceability
The blunt-cut 14 AWG leads eliminate the open-blade connection point that sometimes becomes a corrosion site. They crimp or splice neatly into sealed connectors and heat-shrink splices, reducing failure points in mobile equipment. The universal 15/32-inch panel hole and face nut allow rapid installation with standard tooling.

Selection & deployment notes

• Choose the right function across the family. If you need a momentary function for push-to-signal or spring-return enable, select 55025-01. For circuits requiring a center Off and two outputs (e.g., directional control), 55025-02 (SPDT On-Off-On) is convenient. If you need two poles, step to 55026 (DPST) to switch two isolated circuits simultaneously. These variants keep the same mechanical footprint and sealing approach.

• Panel planning. Maintain the 15/32-inch (11.90 mm) through-panel hole and ensure adequate clearance for the handle throw and wiring bend radius behind the panel. The nickel-plated brass face nut provides a clean finish and firm clamp force into metal or reinforced plastic panels.

• Environmental best practices. IP67 sealing protects against dust and temporary immersion, but for pressure-wash zones, orient the actuator to minimize direct jet impact, and route leads downward to form a drip loop before entering harnesses. The –40 °C to +85 °C rating covers most mobile environments; validate enclosure heat rise if the switch sits near heaters or engine compartments.

• Electrical design considerations. Use appropriately rated fusing or circuit protection upstream of the switch per load current. For inductive loads such as solenoids or motors, add flyback diodes or suppression devices to reduce arcing and prolong contact life. (General good practice; the 55025’s datasheet ratings specify allowable continuous current and voltage.)

• Operator ergonomics. The standard 11/16-inch (17.46 mm) handle is easy to toggle with gloves, and the clear On-Off detents help avoid partial engagement. Label the panel with durable legends to reflect the function and voltage.

Ordering guide (family overview)

• 55025 – On-Off, SPST (hardware assembled).

• 55025-01 – Momentary On-Off, SPST.

• 55025-02 – On-Off-On, SPDT.

• 55025-03 – On-On, SPDT.

• 55025-04 – Momentary On-Off-Momentary On, SPDT.

• 55026 – On-Off, DPST.
  All share the sealed, rugged construction and panel format, making it easy to standardize across multiple functions in the same machine.

In practice: example use cases

• Cab work-lamp control on a skid-steer: direct switching of an LED light bar at 12 V with upstream fuse protection; sealed toggle resists mud and pressure washing after shifts.

• Auxiliary pump enable on a sprayer: operators get a distinct, glove-friendly toggle; sealed leads tie into a weather-proof harness; IP67 protection limits downtime due to moisture ingress.

• Beacon/strobe activation on a service truck: simple On-Off circuit at 12 V or 24 V; panel mount through standardized 15/32-in hole; nickel-plated face nut provides durable finish in exposed panels.

Summary

The Littelfuse 55025 sealed toggle switch is a compact, field-proven operator control for harsh environments. With IP67 sealing, robust 12/24 VDC current ratings, glove-friendly actuation, and easy panel integration, it fits the everyday realities of off-highway equipment and specialized vehicles. The availability of momentary, SPDT, and DPST siblings lets you cover a wide range of control functions without changing panel mechanics or environmental performance. If you need a rugged On-Off toggle that simply works—day after day, season after season—the 55025 is an excellent place to start.