Masterlock Grip Tight Plus Circuit Breaker Lockout Device Miniature Circuit Breakers (120/240 V) Box of 6 - S3821
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Masterlock Grip Tight Plus Circuit Breaker Lockout Device Miniature Circuit Breakers (120/240 V) - S3821
The Master Lock S3821 Grip Tight(TM) Plus Circuit Breaker Lockout Device is designed for safely locking out miniature circuit breakers operating at 120/240 volts. Ideal for electricians and safety professionals, this device ensures secure and reliable lockout/tagout procedures without the need for tools. Its compact and versatile design supports a range of breaker handle shapes and sizes, enhancing workplace safety and compliance.
Key features
- Fits miniature circuit breakers rated 120/240 V
- Lightweight, one-piece construction for easy handling
- Stainless steel thumbscrew with knurled grip for secure tightening
- Compact size enables locking out vertically and horizontally adjacent breakers
- Compatible with multi-pole breakers and tie-bar toggles
- Tool-free installation for quick and consistent application
- Toothed jaw design provides a firm grip on breaker handles
Ideal applications
- Electrical maintenance and repair operations
- Industrial facilities requiring lockout/tagout compliance
- Construction sites managing circuit breaker safety
- Manufacturing plants with complex electrical panels
- Utility and energy sector equipment servicing
Why buyers choose this product
This lockout device offers a reliable and user-friendly solution for securing miniature circuit breakers. Its durable stainless steel thumbscrew and toothed jaw ensure a tight grip, while the compact form factor allows for use in tight panel spaces. The tool-free installation speeds up lockout procedures, improving efficiency and safety on the jobsite.
Specifications
| Brand | Master Lock |
| Product number | S3821 |
| Product type | Grip Tight Plus Circuit Breaker Lockout Device |
| Color | Red |
| Compatible breakers | Miniature Circuit Breakers (120/240 V), multi-pole breakers, tie-bar toggles |
| Material | Stainless steel thumbscrew, durable plastic body |
| Installation | Tool-free with thumbscrew tightening |
| Shelf pack quantity | 6 |
| Master carton quantity | 36 |
Additional product details
The device's compact and lightweight design allows it to fit in tight spaces and lock out breakers arranged both vertically and horizontally. Its one-piece construction simplifies handling and reduces installation time, making it suitable for a variety of electrical panel configurations. The stainless steel thumbscrew includes a slot for optional screwdriver adjustment, enhancing versatility in different work environments.
The Master Lock S3821 Grip Tight(TM) Plus Circuit Breaker Lockout Device is an effective tool for ensuring electrical safety and compliance during maintenance and repair tasks involving miniature circuit breakers.
MFG Part #: S3821
| Product Type | Lockout Tagout |
|---|
Shipping
We Ship Internationally - We can ship to virtually any address in the world, with some restrictions on certain products.
Standard Delivery: Ground shipping typically delivers in approximately 5 business days from our Columbus, OH warehouse.
Expedited Options Available:
- Priority and Expedited handling speeds up processing
- Overnight shipping available (guaranteed) - must order by phone before 12pm EST M-F
- Some items ship "Manufacturer Direct" and cannot be expedited
Important: Inspect your delivery before signing! Note any damage on the shipping document.
Returns Policy
30-Day Return Window: Most new, unopened items can be returned within 30 days for a full refund.
Non-Returnable Items:
- Made-to-order fall protection products
- Used vacuums, respirators, gas monitors, or air scrubbers
- Calibration gas (hazardous material)
- PAPR and specialty respiratory items (non-stock)
Restocking Fee: 30% restocking fee or shipping costs apply if return is due to buyer error.
Refund Timeline: Expect refunds within 4 weeks, though many are processed faster.

