NZMH4 Klockner Moeller Molded-Case Circuit Breakers

NZMH4 Klockner Moeller Molded-Case Circuit Breakers
Klockner Moeller           Siemens
Lancaster, PA
(717) 209-7100
Klockner Moeller
NZMH4 Circuit Breakers
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***Items on this page are obsolete - Availability is limited to quantities in stock***
Klockner Moeller NZMH4 Circuit Breakers


see more photos
NZMH4 Breakers, Adjustable Thermal Trip
for use as motor protectors.
Amps Catalog # Price
4 - 6 NZMH4-6-CNA photo 690.00
6 - 10 NZMH4-10-CNA photo
10 - 16 NZMH4-16-CNA photo
16 - 25 NZMH4-25-CNA photo
25 - 40 NZMH4-40-CNA photo
40 - 63 NZMH4-63-CNA photo
63 - 80 NZMH4-80-CNA photo 845.00
Accessories for NZMH4 series
Description Catalog # Price
gray handle H6-NA photo 349.00
red/yellow handle RH6-NA photo 349.00
rear-operated red/yellow handle RH6-R-NA 349.00
drive shaft extension A-NZM6 photo 52.00
rear-drive shaft R-NZMH4 82.00
standard auxiliary contacts NHi22-NZM4/6-NA photo 99.00
early-make auxiliary contacts VHi-NZMH4 photo
early-make auxiliary contacts
trip-indicating auxiliary contacts RHi-NZMH4
undervoltage trip U-NZM4/6 photo 364.00
shunt trip A-NZM4/6 photo

drive shaft coupling
Arrowhead4/6 54.00

Selection of a Replacement Circuit Breaker

Here are some questions we need to ask in order to select the best replacement unit.

  1. Please provide the full part number of the old unit.

  2. What is the machine voltage, the 3-phase power at the main lugs?

    If it is 480 Volts, we need to know if it is 480-Y or 480-Delta.
    To determine this, measure the voltage from each leg to ground or neutral.
    If all 3 are roughly to same, it's 480-Y and if one leg is much higher than the other 2, then it is 480-Delta.

  3. Are there any small wires connected to the unit, other than on the main lugs?

    If so, there may be an undervoltage trip or auxiliary contacts. Look for small labels, marked "Aux. Switch" or "Undervoltage Release" and note the part numbers. If these are present, are you able to provide a copy of the wiring diagram?

  4. If your unit is adjustable (the yellow dial on the front), how many amps do you wish to set it to? The new units have different adjustment ranges.

  5. Is there an operating handle on the outside of the cabinet?   If so -

          - is it located on the door?
          - is it located on the right side wall of the cabinet?
          - is it located on the left side wall of the cabinet?
          - is it located in the back of the cabinet?

    Each location requires different hardware.

  6. Photos of the unit showing the installation and wiring are always helpful.