MLC506 MFG #: 506
$20.87 / EA
  • Offerings: Products
  • Circuit Breaker Voltage: 120/277 VAC
  • Padlock Shackle Maximum Diameter: 9/32 in
  • Color: Red
  • Suitable For Use With: 491B (1TDB1) Tall and Wide Toggle, 493B (1TDB2) Standard Single and Double Toggle
  • Material: Steel
  • Brand Name: Master Lock®
The Master Lock No. 506 grip Tight™ Circuit Breaker Lockout combo pack includes one 491B and one 493 grip Tight™ circuit breaker lock out. The innovative and patented grip-tight design effectively locks out circuit breakers with a simple operation and the durable construction with powder coated steel and reinforced polymer stands up to harsh environments. Devices are compact and accept all American Lock® and Master Lock® safety padlock shackles and most lock out hasps.
  • Width
  • Type
  • Manufacturer Name
  • Height
  • Series
  • Overview
  • Maximum Number of Padlocks
  • Depth
3-1/2 in (491B (1TDB1)), 3/4 in (493B (1TDB2))
Master Lock
1-1/4 in (491B (1TDB1)), 3/4 in (493B (1TDB2))
Grip Tight™


  • Fits virtually all circuit breakers you will find in a lock out situation
  • Grip Tight™ circuit breakers work with simple thumb turn and clamping handle
  • Innovative patented grip Tight™ design effectively locks out circuit breakers
  • Adjust to breaker with simple thumb turn and then close clamping handle for a tight grip-on the toggle
  • Great strength with universal fit
  • 491B fits wide or tall breaker toggles typically found on hi-voltage/hi-amperage breakers
  • 493B fits standard height and tie bar toggles typically found on 120 and 240 volt breakers
  • Compact lock out device is easy to carry and easy to store


  • Electrical Lockout and Safety Lockout/Tagout
3-1/2 in, 3 in