Master Lock
Master Lock S3823 Circuit Breaker Lockout Clamp-On Key Control
Clamp-on lockout secures oversized circuit-breaker handles up to 480/600 V with one padlock
- Secures 480/600 V breakers with clamp-on screw design
- Fits oversized handles on single- and two-pole units
- Accepts one padlock up to 9/32 in shackle
- Nylon, stainless steel and thermoplastic resist impact and corrosion
- Compact 4 3/64 in width suits tight panels
Circuit Breaker Lockout for 480/600 V Systems
The Master Lock S3823 is a clamp-on lockout device built for oversized-handle circuit breakers rated up to 480/600 volts. It fits single-pole and two-pole breakers and accepts one padlock with a shackle up to 9/32 inch diameter. Maintenance and electrical safety teams use it to isolate energy sources during service work.
Nylon, Stainless Steel
The body combines nylon, stainless steel and thermoplastic to resist impact, chemicals and temperature extremes in industrial panels. A screw-tightened clamp secures the device to the breaker handle so vibration cannot shake it loose. The red and black colour coding helps authorised workers identify the lockout point quickly.
Screw-Clamp Installation With Single-Padlock Limit
Turn the integrated screw by hand or with a basic driver to clamp the jaws onto the oversized handle; no special tools are required. The design accommodates only one padlock, so procedures needing multiple authorised persons must use a group lockout box instead. Verify the breaker handle thickness before purchase because the clamp range is fixed.
Highlights
- Secures 480/600 V breakers with clamp-on screw design
- Fits oversized handles on single- and two-pole units
- Accepts one padlock up to 9/32 in shackle
- Nylon, stainless steel and thermoplastic resist impact and corrosion
- Compact 4 3/64 in width suits tight panels
Specifications
| Brand | MASTER LOCK |
|---|
Questions about this item
Will the nylon body or stainless-steel clamp need periodic replacement?
The lockout is moulded from nylon and thermoplastic with a stainless-steel screw; no replacement interval is defined, so inspect for cracks or wear before each use and replace if damaged.
What stops me from using this on a larger breaker handle?
The clamp-on design fits oversized handles up to 4 3/64 in wide and accepts a single padlock with a shackle up to 9/32 in diameter.
Does the device get hot or draw power when left on a live 480/600 V panel all day?
It is a passive mechanical lockout with no electrical components, so it generates no heat and consumes no power while installed.
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