Battery isolation switches sit in tough spots. Under bonnets, on exposed panels, in wheel arches, on the sides of machines that spend their working lives in dust, rain, mud, and heat. If the switch fails because moisture or contamination has got into the housing, you don’t just have an unreliable switch. You have an isolation device you can’t trust.
The LS14008 Cole Hersee Isolation Switch is built around a straightforward answer to this problem: O-ring sealing that keeps the elements out, regardless of where the switch is mounted or what conditions the machine is operating in.
What O-Ring Sealing Actually Does
An O-ring is a precision-fit rubber gasket that creates a compressed seal between two surfaces. In the context of an isolation switch, it prevents water, dust, and fine particulates from entering the housing through the mounting stem, which is the most vulnerable point on any panel-mounted switch.
The mounting stem is where the switch passes through whatever it’s bolted to. Without a seal at this interface, moisture tracks along the stem and into the switch body. Once inside, it attacks the contacts. Corrosion builds up, resistance across the contacts increases, and the switch either stops operating cleanly or, in a worst case, fails to provide positive isolation.
The LS14008’s O-ring seal eliminates that pathway. The compressed gasket sits in the stem and maintains contact pressure against the mounting panel surface, blocking ingress even when the switch is exposed to washdowns, rain, or high-humidity environments.
The Operating Environment Context
It’s worth being specific about what “weather resistance” means in mining and construction.
A haul truck operating in the Pilbara will be pressure-washed regularly. That’s a direct high-pressure water stream aimed at the undercarriage and panels. A dozer working in a wet season up north will have water running across every exposed surface for weeks at a time. Underground mining equipment operates in environments where condensation, water ingress, and humidity are constant. A concrete agitator truck on a construction site gets hosed down every shift.
These aren’t marginal conditions. An isolation switch that’s “splash resistant” or “weather proof in normal conditions” isn’t adequate. The O-ring sealed design of the LS14008 addresses this directly. It’s specified for these environments, not just tested in them.
Specifications That Support the Claim
The LS14008’s sealing isn’t a standalone feature. It works with the rest of the switch’s construction to make a genuinely robust unit.
Electrical ratings: 2000A intermittent, 300A continuous. These are the figures that matter for heavy equipment. 2000A covers the starting load on large diesel engines, while 300A continuous handles the sustained draw of running systems.
Voltage range: 6-36V DC, which covers the full range from standard 12V vehicles through to the 24V systems common on heavy mining and construction plant.
Terminal configuration: 2 x 12.5mm main terminals and 2 x 4.5mm field terminals. The main terminals carry the primary battery circuit; the field terminals interrupt the alternator field circuit in the OFF position, which prevents voltage being fed back into the system through the charging circuit when the switch is open.
Physical dimensions: 75mm x 125mm overall, 19mm mount diameter, 6mm mount length, 0.55kg. Compact enough to fit standard panel cutouts without modification.
The combination of a robust electrical specification and weather-sealed housing means the switch doesn’t force a trade-off between performance and protection. Both are built into the same unit.
Where It Fits in a Complete Isolation System
The LS14008 is a core component in several of Locksafe’s isolator assemblies, most notably the LS13005-01, which combines the switch with a locking bracket to create a complete lockable isolation assembly for the main battery circuit.
The weather sealing of the switch matters here because the whole point of a lockout system is certainty. When a worker applies their padlock to a locked-out machine, they need to know that the isolation is positive: that the machine cannot be started, that the battery circuit is genuinely open, and that it will stay that way until the padlock is removed. A switch that’s been compromised by moisture ingress over time doesn’t provide that certainty.
Using a switch that’s rated for the environment it’s installed in is part of getting that certainty right from the start.
You can view the full range of isolation switches available from Locksafe, including the LS14008 and compatible locking brackets, on the switches product page.
A Practical Note on Installation
The O-ring seal only performs as designed when the switch is installed correctly. A few points worth checking:
Panel thickness: The LS14008 has a 6mm mount length, which means it suits panels up to 6.4mm thick. Thicker panels will compress the O-ring unevenly or prevent proper seating. Check panel thickness before ordering.
Mounting torque: Over-tightening the mounting nut compresses the O-ring beyond its designed range and can cause it to deform or crack over time, compromising the seal. Tighten to the manufacturer’s specified torque rather than by feel.
Orientation: Where possible, mounting the switch so the terminals face downward reduces the chance of water pooling against the terminal insulator, which adds a secondary layer of protection beyond the O-ring itself.
For technical questions about the LS14008 or advice on selecting the right switch and bracket combination for a specific application, contact Locksafe directly at info@locksafe.com.au or 08 9455 7255.
