System PKZ0 Manual Motor Protective Circuit Breakers for Group Load PKZM0 motor protectors in group motor applications: PKZM0 motor protectors are UL listed and CSA certified for group applications as per the intent of NEC 430-53 and CEC part 1, rule 28-206. This eliminates the need for individual motor branch circuit overcurrent protective devices for each motor, thus greatly reducing the cost and space requirements of industrial control panels and assemblies.
In group installations involving a number of PKZM0 motor protectors, the maximum rating of the group branch circuit overcurrent protective device is based on the lowest backup overcurrent rating marked on each motor in the group, combined with applicable NEC/CEC installation rules.
The PKZM0-motor protectors through 16 A, have also passed additional UL tests and are marked: ′′Suitable for tap conductor protection in group installations′′. They can thus be applied for tap conductor overcurrent protection in group installations per the intent of Article 430.53 of the NEC 2002. Tap conductor protective ratings: PKZM0-0.16 10: 50 kA RMS @ 480Y/277 V PKZM0-16: 42 kA RMS @ 480Y/277 V Suitable for tap conductor protection in group installations.
System PKZ0 Manual Motor Protective Circuit Breakers for Inductive Load The PKZM 0-(T) is a 3-phase thermal magnetic motor protective device incorporating adjustable bimetal trips for motor overload protection and magnetic trips to de-energize the motor circuit in case of a short-circuit. The PKZM 0-T has its magnetic trip set at a higher response level to provide better protection against nuisance tripping in circuits with higher current inrush ratings, e.g. in circuits employing control circuit transformers. The PKZM 0-and PKZM 0-T are UL listed and CSA certified as HP rated motor controllers which provide motor running overload protection. In addition, they are UL listed and CSA certified for group applications as per NEC 430-53(c) and CEC part 1, Rule 28- 206. This means that a group of motors, each protected and controlled by a PKZM 0-(T) can be combined under a single branch circuit short circuit and ground fault protective device, the maximum rating of which is marked on each PKZM 0 motor protector. The PKZM0-T cannot be combined with the high-capacity contactor module
System PKZ2 Manual Motor Protective Circuit Breakers The PKZ2/ZM- is a 3-phase thermal magnetic motor protective device incorporating adjustable bimetal trips for motor overload protection and magnetic trips to de-energize the motor circuit in case of a short-circuit.
Both devices are UL listed and CSA certified as HP rated motor controllers which provide motor running overload protection. In addition, they are UL listed and CSA certified for group applications as per NEC 430-53(c) and CEC part 1, rule 28-206. This eliminates the need for individual motor branch circuit overcurrent protective devices for each motor, thus greatly reducing the cost and space requirements of industrial control panels and assemblies. This means that a group of motors, each protected and controlled by a PKZ2/ZM(/S) can be combined under a single branch circuit short-circuit and ground fault protective device, the maximum rating of which is marked on each PKZ2 motor protector.
In group installations involving a number of System PKZ 2 motor protectors, the maximum rating of the group branch circuit overcurrent protective device is based on the lowest backup overcurrent rating marked on each motor protector in the group, combined with applicable NEC/CEC installation rules.
System PKZ2 Motor Protective Circuit Breaker without Trip Module The PKZ 2 manual motor protector and PKZ 2/S motor protector combination without plug-in trip modules make up one frame size rated for a maximum continuous motor load current of 42 A. These devices can be stocked, or mounted and wired in a panel, without prior knowledge of motor Hp ratings. Motor overload and overcurrent protection is provided by the plug-in motor protective trip modules shown at the next page which are inserted into the slots below the handle (between the disconnect and contactor portions) and enable the motor protector to cover a motor range from fractional Hp up to 30 Hp at 460/575 V AC.
Once motor loads are determined, selection of the appropriate plug-in motor protective trip module can take place. Exchanging trip modules is easy and does not require any removal of wiring or cables. Removal of the trip modules provides an additional safety benefit by creating an open circuit path to the motor. This still allows the performance of routine motor maintenance tasks and circuit function checks but effectively rules out any inadvertent energization of the motor.
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