The breaker lock plate is used to prevent the breaker from being turned on or off.
ABB
ABB Mechanical interlock XT6
ABB Rotary-RHE XT5 Normal Transmitted
ABB AUX-C 1Q+1SY 250Vac/dc XT1...XT6 F/P
ABB RHD XT7 F/W STAND. DIRECT
ABB Motor Operator XT6 220-250VAC/DC
ABB Motor Operator 220v. XT1,XT3
ABB Auxiliary Contact XT7 1SY 400V
ABB RHE XT7 F/W STAND. RETURNED
ABB RHE XT1-XT3 F/P STAND. RETURNED
ABB Electronic time Delay T1..T6-XT1..XT4 220..250Va
ABB Mechanical Interlock XT3
ABB Mechanical interlock XT5
US 
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