Self-locking molded case circuit breaker lockout
DPD1
DPD1 Self-Locking Clamp-On Circuit Breaker Lockout is a professional LOTO safety device designed for medium molded case circuit breakers (MCCBs). Constructed from high-strength PA insulating material, it delivers excellent durability, corrosion resistance, and electrical safety for industrial maintenance environments.
- Premium PA material for high strength, insulation and corrosion resistance
- Blade-style design for tighter grip with less operating force
- Special-shaped screw + hinged flap for anti-loose & anti-tampering
- Built-in brass lock cylinder replaces traditional padlocks for efficiency
- Detachable clamping plate (included) expands breaker compatibility
- Slidable long clamp ensures stable and universal fitting
- Works with ≤8mm shackle hasp locks & padlocks for LOTO compliance
- Tool-free installation, red & black high-visibility for job site safety
Product Appearance


Core parameters:
- Product Name:DPD1 Self-Locking Clamp-On Circuit Breaker Lockout
- Material:PA (Nylon) – Insulated & Heavy-Duty
- Product Size:88mm × 72.4mm × 32.3mm (L×W×Thickness)
- Color:Red + Black
- Compatible Handle:Width ≤32mm, Thickness ≤18mm
- Application:Medium molded case circuit breakers (MCCB)
- Locking Method: Special shaped screw + hinged anti-loose flap + built-in brass cylinder
- Lock Compatibility:Shackle diameter ≤8mm (hasp locks & padlocks)
- Installation:Tool-free hand-tighten
- Key Features:Self-locking, detachable plate, slidable clamp, anti-loose, LOTO compliant
FAQs
1What breakers does DPD1 fit?
DPD1 fits most medium molded case circuit breakers with handle width ≤32mm and thickness ≤18mm.
2What material is DPD1 made of?
DPD1 is made of high-strength PA insulating nylon, durable and safe for industrial LOTO use.
3Does DPD1 require a padlock?
No. It has a built-in brass lock cylinder for direct self-locking; it also supports ≤8mm shackle hasp locks/padlocks.
4How does DPD1 prevent loosening?
It uses a special-shaped screw to fix the lock and a hinged flap to cover and lock the screw, preventing vibration and tampering.
5Is installation tool-free?
Yes. Just hand-tighten the special screw and fasten the flap – no tools needed.
6What is the size of DPD1?
Dimensions: 88mm × 72.4mm × 32.3mm, compact for most electrical panels.




