Eaton NZMB2-A250 Molded-Case Circuit Breaker 3-Pole 250A 25KA

Eaton NZM2 molded-case circuit breaker, type NZMB2-A250. 3-pole, rated current 250 A, breaking-capacity class B, frame size NZM2 (up to 250 A). Rated operational voltage 690 V AC; rated ultimate short-circuit breaking capacity (Icu) 25 kA at 400/415 V AC to IEC/EN 60947-2. Thermomagnetic release — adjustable thermal overload and electromagnetic short-circuit protection. Utilization category A, suitable for isolation.

Manufacturer part number (MPN)

NZMB2-A250

Series

Eaton NZM2 (Moeller series NZM)

Type

Molded-case circuit breaker (MCCB)

Breaking-capacity class

B (basic breaking capacity)

Number of poles

3-Pole

Rated current (In)

250 A

Frame size

NZM2 (up to 250 A)

Rated operational voltage (Ue)

690 V AC

Rated insulation voltage (Ui)

800 V

Rated ultimate short-circuit breaking capacity (Icu) at 400/415 V AC

25 kA

Trip unit / release

Thermomagnetic release — adjustable thermal overload and electromagnetic short-circuit protection

Utilization category

A

Suitable for isolation

Yes

Standard

IEC/EN 60947-2

EAN / GTIN

4015082590901

HS code

8536.20

Sales unit

pcs

Eaton catalogue number

259090

Depth

149 mm

Height

184 mm

Width

105 mm

Weight

2.368 kg

Compliances

RoHS conform

Certifications

IEC; IEC/EN 60947

Functions

System and cable protection

Amperage Rating

250 A

Application

Use in unearthed supply systems at 440 V

Circuit breaker frame type

NZM2

Connection

Screw

Features

Motor drive optional; Protection unit

Release system

Thermomagnetic release

Special features

Maximum back-up fuse, if the expected short-circuit currents at the installation location exceed the switching capacity of the circuit breaker (Rated short-circuit breaking capacity Icn) Rated current = rated uninterrupted current: 250 A

Ambient operating temperature - max

70 °C

Ambient storage temperature - max

70 °C

Ambient operating temperature - min

-25 °C

Equipment heat dissipation, current-dependent

58.13 W

Rated operational current for specified heat dissipation (In)

250 A

Direction of incoming supply

As required

Electrical connection type of main circuit

Screw connection

Handle type

Rocker lever

Instantaneous current setting (Ii) - max

2500 A

Instantaneous current setting (Ii) - min

1500 A

Isolation

300 V AC (between the auxiliary contacts); 500 V AC (between auxiliary contacts and main contacts)

Lifespan, electrical

10000 operations at 400 V AC-1; 7500 operations at 415 V AC-1

Number of operations per hour - max

120

Overload current setting (Ir) - max

250 A

Overload current setting (Ir) - min

200 A

Overvoltage category

III

Pollution degree

3

Rated impulse withstand voltage (Uimp) at auxiliary contacts

6000 V

Rated impulse withstand voltage (Uimp) at main contacts

8000 V

Rated short-circuit making capacity Icm at 240 V

50/60 Hz

63 kA

Rated short-circuit making capacity Icm at 400/415 V

50/60 Hz

53 kA

Rated short-circuit making capacity Icm at 440 V

Rated short-time withstand current (t = 1 s)

85 kA

Short-circuit release non-delayed setting - max

2500 A

Short-circuit release non-delayed setting - min

1500 A

Short-circuit total breaktime

< 10 ms

Voltage rating

440 V - 440 V

Climatic proofing

Damp heat, constant, to IEC 60068-2-78; Damp heat, cyclic, to IEC 60068-2-30

Degree of protection

IP20 (basic degree of protection, in the operating controls area); IP20

Degree of protection (IP), front side

IP40 (with insulating surround); IP66 (with door coupling rotary handle)

Degree of protection (terminations)

IP00 (terminations, phase insulator and strip terminal); IP10 (tunnel terminal)

Lifespan, mechanical

20000 operations

Mounting Method

Fixed; Built-in device fixed built-in technique; DIN rail (top hat rail) mounting optional

Number of auxiliary contacts (change-over contacts)

0

Number of auxiliary contacts (normally closed contacts)

0

Number of auxiliary contacts (normally open contacts)

0

Position of connection for main current circuit

Front side

Protection against direct contact

Finger and back-of-hand proof to DIN EN 50274/VDE 0106 part 110

Shock resistance

20 g (half-sinusoidal shock 20 ms)

Optional terminals

Box terminal. Connection on rear. Tunnel terminal

Standard terminals

Screw terminal

Terminal capacity (aluminum solid conductor/cable)

10 mm² - 16 mm² (1x) direct at switch rear-side connection; 10 mm² - 16 mm² (2x) direct at switch rear-side connection; 16 mm² (1x) at tunnel terminal

Terminal capacity (aluminum stranded conductor/cable)

25 mm² - 50 mm² (2x) direct at switch rear-side connection; 25 mm² - 50 mm² (1x) direct at switch rear-side connection; 25 mm² - 185 mm² (1x) at tunnel terminal

Terminal capacity (control cable)

0.75 mm² - 2.5 mm² (1x); 0.75 mm² - 1.5 mm² (2x)

Terminal capacity (copper busbar)

Min. 16 mm x 5 mm direct at switch rear-side connection; Max. 24 mm x 8 mm direct at switch rear-side connection; M8 at rear-side screw connection

Terminal capacity (copper solid conductor/cable)

16 mm² (1x) at tunnel terminal; 6 mm² - 16 mm² (2x) direct at switch rear-side connection; 10 mm² - 16 mm² (1x) direct at switch rear-side connection; 10 mm² - 16 mm² (1x) at box terminal; 6 mm² - 16 mm² (2x) at box terminal

Terminal capacity (copper stranded conductor/cable)

25 mm² - 70 mm² (2x) direct at switch rear-side connection; 25 mm² - 185 mm² (1x) direct at switch rear-side connection; 25 mm² - 70 mm² (2x) at box terminal; 25 mm² - 185 mm² (1x) at 1-hole tunnel terminal; 25 mm² - 185 mm² (1x) at box terminal

Terminal capacity (copper strip)

Max. 10 segments of 24 mm x 0.8 mm at rear-side connection (punched); Min. 2 segments of 9 mm x 0.8 mm at box terminal; Max. 8 segments of 24 mm x 1 mm (2x) at box terminal; Max. 10 segments of 16 mm x 0.8 mm at box terminal; Min. 2 segments of 16 mm x 0.8 mm at rear-side connection (punched)

Standard

Eaton NZM

HS Code

8536.20

• EAN 4015082590901
• SAP 1000078289
• Code 8822529