Waterproof Ball Switches

CPI’s line of sealed roller ball switches are made of 100% stainless steel and boast a patented sealing mechanism that makes them 100% waterproof over millions of cycles. Variations including custom mounting for PCB’s or extended temperature range operation with our J4 B series models. All our ball switches come with pre-integrated and sealed leads in specifiable lengths, and can be ordered in normally open/closed configurations. Extended temperature switch versions are rated to operate from -40F to +302F.

Waterproof Ball Switches – Precision Under Pressure

CPI’s J4 Series Waterproof Ball Switches represent the next generation of high-reliability motion and position sensors for demanding military and industrial systems.
Constructed entirely from plated stainless steel, these switches are engineered to withstand shock, vibration, and total submersion — while maintaining electrical and mechanical integrity across millions of cycles.

At the heart of the J4 design lies CPI’s patented sealed ball carrier mechanism, which prevents mud, dirt, ice, sand, and other contaminants from jamming the actuator.
The result is a compact, fully waterproof switch that continues to perform flawlessly in environments that destroy conventional ball switches.

Extreme Temperature Endurance

Temperature resilience is one of the strongest advantages of the J4 Series.
While most sealed switches are rated only to about 85 °C, CPI’s J4 devices are tested and qualified for operation up to +302 °F (+150 °C), and as low as –40 °F (–40 °C).
This makes them ideal for engine compartments, outdoor vehicle controls, and high-heat industrial systems, where thermal stability and sealing integrity are equally critical.

Technical Highlights

Electrical Rating: 5 A inductive @ 28 VDC
Electrical Configuration: SPST – Normally Open (J4001) or Normally Closed (J4002)
Operating Temperature: –40 °F to +257 °F (–40 °C to +125 °C); extended-range versions to +302 °F (+150 °C)
Body Material: 100% plated stainless steel
Sealing: Fully waterproof and submersible
Travel:
– Pre-travel (NO): 0.032 in (0.93 mm)
– Pre-travel (NC): 0.004 in (0.10 mm)
Lead Wires: 16 AWG GXL insulated, 24 in (610 mm) standard

Applications

Neutral-safety and park-brake sensing
Cab-down, door, and compartment detection
Outrigger and boom position feedback
Hydraulic valve status sensing
Heavy equipment and marine control systems
Harsh-environment industrial automation

Built to Last

Originally developed for military vehicle programs, CPI’s J4 Ball Switches have been proven through years of field use in the harshest operational conditions on earth.
Unaffected by water, salt spray, dirt, ice, oil, or vibration, these switches offer maintenance-free, long-life performance where reliability cannot be compromised.