The breaker lock plate is used to prevent the breaker from being turned on or off.
ABB
ABB Front Flange-FLD XT6 F/P (Padlock)
ABB XT1..XT4 Undervoltage releases 220..240Vac.
ABB RHE XT2-XT4 F/P STAND. RETURNED
ABB Mechanical Interlock XT3
ABB AUX-C 2Q+1SY 250Vac/dc XT1...XT6 F/P
ABB Undervoltage releases XT5-XT6 220V
ABB E1.2..E6.2-XT7-XT7M Shunt Opening 220-240Vac
ABB RHD XT2-XT4 F/P STAND. DIRECT
ABB E1.2..E6.2-XT7-XT7M 220..240VAC/DC Undervoltage
ABB Motor Operator XT6 220-250VAC/DC
ABB AUX-C 3Q+1SY 250Vac/dc XT2..XT6 F/P
ABB Motor Operator 220v. XT1,XT3