Special features
- Non-delayed disconnection of NZM circuit-breaker or N switch-disconnector when the control voltage sinks below 35 – 70% US.
- For use with emergency-stop devices in connection with an emergency-stop button.
- When the under-voltage trip is switched off, accidental contact with the circuit breaker’s primary contacts is prevented when switched on.
- Undervoltage releases cannot be installed simultaneously with NZM...-XHIV... early-make auxiliary contact or NZM...-XA... shunt release.
10.10 Temperature rise
The panel builder is responsible for the temperature rise calculation. Eaton will provide heat dissipation data for the devices.
10.11 Short-circuit rating
Is the panel builder's responsibility. The specifications for the switchgear must be observed.
10.12 Electromagnetic compatibility
Is the panel builder's responsibility. The specifications for the switchgear must be observed.
10.13 Mechanical function
The device meets the requirements, provided the information in the instruction leaflet (IL) is observed.
10.2.2 Corrosion resistance
Meets the product standard's requirements.
10.2.3.1 Verification of thermal stability of enclosures
Meets the product standard's requirements.
10.2.3.2 Verification of resistance of insulating materials to normal heat
Meets the product standard's requirements.
10.2.3.3 Resist. of insul. mat. to abnormal heat/fire by internal elect. effects
Meets the product standard's requirements.
10.2.4 Resistance to ultra-violet (UV) radiation
Meets the product standard's requirements.
10.2.5 Lifting
Does not apply, since the entire switchgear needs to be evaluated.
10.2.6 Mechanical impact
Does not apply, since the entire switchgear needs to be evaluated.
10.2.7 Inscriptions
Meets the product standard's requirements.
10.3 Degree of protection of assemblies
Does not apply, since the entire switchgear needs to be evaluated.
10.4 Clearances and creepage distances
Meets the product standard's requirements.
10.5 Protection against electric shock
Does not apply, since the entire switchgear needs to be evaluated.
10.6 Incorporation of switching devices and components
Does not apply, since the entire switchgear needs to be evaluated.
10.7 Internal electrical circuits and connections
Is the panel builder's responsibility.
10.8 Connections for external conductors
Is the panel builder's responsibility.
10.9.2 Power-frequency electric strength
Is the panel builder's responsibility.
10.9.3 Impulse withstand voltage
Is the panel builder's responsibility.
10.9.4 Testing of enclosures made of insulating material
Is the panel builder's responsibility.
Used with
NZM2(-4), N(S)2(-4)
NZM3(-4), N(S)3(-4)
Minimum command time - max
Minimum command time - min
Number of contacts (normally open contacts)
Pick-up power consumption at AC (undervoltage release)
Pick-up power consumption at DC (undervoltage release)
Rated control supply voltage
Rated control supply voltage (Us) at AC, 50 Hz - max
Rated control supply voltage (Us) at AC, 50 Hz - min
Rated control supply voltage (Us) at AC, 60 Hz - max
Rated control supply voltage (Us) at AC, 60 Hz - min
Drop-out voltage of undervoltage release AC/DC - max
Drop-out voltage of undervoltage release AC/DC - min
Terminal capacity (solid/flexible conductor)
18 - 14 AWG (1x) for undervoltage releases, off-delayed
0.75 mm² - 2.5 mm² (1x) for undervoltage releases, off-delayed with ferrule
0.75 mm² - 2.5 mm² (2x) at shunt release with ferrule
0.75 mm² - 2.5 mm² (2x) for undervoltage releases, off-delayed with ferrule
18 - 14 AWG (2x) for undervoltage releases, off-delayed
18 - 14 AWG (1x) at shunt release
0.75 mm² - 2.5 mm² (1x) at shunt release with ferrule
18 - 14 AWG (2x) at shunt release
Power consumption
1.5 VA (sealing AC)
0.8 W (sealing DC)
Rated control supply voltage (Us) at DC - max
Rated control supply voltage (Us) at DC - min
Number of contacts (normally closed contacts)
Number of contacts (change-over contacts)
Undelayed short-circuit release - min
Undelayed short-circuit release - max
Rated control voltage (relay contacts)