| Manufacturer part number (MPN) | NZMH4-PX1250-TAZ |
| Series | Eaton NZM4 (Moeller series NZM) |
| Type | Molded-case circuit breaker (MCCB) |
| Breaking-capacity class | H (high breaking capacity) |
| Number of poles | 3-Pole |
| Rated current (In) | 1250 A |
| Frame size | NZM4 (up to 1600 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 | 85 kA |
| Trip unit / release | Electronic trip unit — adjustable LSI protection with integrated energy metering and communication |
| Utilization category | A |
| Suitable for isolation | Yes |
| Standard | IEC/EN 60947-2 |
| EAN / GTIN | 4015081875665 |
| HS code | 8536.20 |
| Sales unit | pcs |
| Eaton catalogue number | 189619 |
| Depth | 375 mm |
| Height | 170 mm |
| Width | 210 mm |
| Weight | 19 kg |
| Compliances | RoHS conform |
| Certifications | IEC; IEC/EN 60947 |
| Functions | Earth-fault protection; Systems, cable, selectivity and generator protection; ARMS maintenance mode; Integrated earth fault protection; Zone selectivity |
| Amperage Rating | 1250 A |
| Application | 525 V |
| Circuit breaker frame type | NZM4 |
| Features | Protection unit; Motor drive optional |
| Release system | Electronic release |
| Ambient operating temperature - max | 70 °C |
| Ambient storage temperature - max | 70 °C |
| Ambient operating temperature - min | -25 °C |
| Equipment heat dissipation, current-dependent | 173.44 W |
| Rated operational current for specified heat dissipation (In) | 1250 A |
| Direction of incoming supply | As required |
| Earth-fault current setting (Ig) - max | 1250 x In |
| Earth-fault current setting (Ig) - min | 250 x In |
| Electrical connection type of main circuit | Screw connection |
| Handle type | Rocker lever |
| Instantaneous current setting (Ii) - max | 37500 A |
| Instantaneous current setting (Ii) - min | 2500 A |
| Isolation | 300 V AC (between the auxiliary contacts); 500 V AC (between auxiliary contacts and main contacts) |
| Lifespan, electrical | 2000 operations at 690 V AC-1; 3000 operations at 400 V AC-1; 3000 operations at 415 V AC-1 |
| Number of operations per hour - max | 60 |
| Overload current setting (Ir) - max | 1250 A |
| Overload current setting (Ir) - min | 500 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 | 275 kA |
| Rated short-circuit making capacity Icm at 400/415 V |
| 50/60 Hz | 187 kA |
| Rated short-circuit making capacity Icm at 440 V |
| Rated short-circuit making capacity Icm at 525 V |
| 50/60 Hz | 143 kA |
| Rated short-circuit making capacity Icm at 690 V |
| 50/60 Hz | 100 kA |
| Rated short-time withstand current (t = 0.3 s) | 19.2 kA |
| Rated short-time withstand current (t = 1 s) | 19.2 kA |
| Short delay current setting (Isd) - max | 10 A |
| Short delay current setting (Isd) - min | 2 A |
| Short-circuit release delayed setting - max | 10 A |
| Short-circuit release delayed setting - min | 2 A |
| Short-circuit release non-delayed setting - max | 15 A |
| Short-circuit release non-delayed setting - min | 2 A |
| Short-circuit total breaktime | < 25 ms (≦ 415 V); < 35 ms (> 415 V) |
| Voltage rating | 690 V - 690 V |
| Climatic proofing | Damp heat, cyclic, to IEC 60068-2-30; Damp heat, constant, to IEC 60068-2-78 |
| Degree of protection | IP20; IP20 (basic degree of protection, in the operating controls area) |
| 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 | 10000 operations |
| Mounting Method | Built-in device fixed built-in technique; Fixed |
| 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 VDE 0106 part 100 |
| Shock resistance | 15 g (half-sinusoidal shock 11 ms) |
| Optional terminals | Connection on rear. Strip terminal. Tunnel terminal |
| Standard terminals | Screw connection |
| Terminal capacity (aluminum stranded conductor/cable) | 50 mm² - 240 mm² (4x) at 4-hole tunnel terminal |
| Terminal capacity (control cable) | 0.75 mm² - 2.5 mm² (1x); 0.75 mm² - 1.5 mm² (2x) |
| Terminal capacity (copper stranded conductor/cable) | 50 mm² - 185 mm² (4x) direct at switch rear-side connection; 120 mm² - 185 mm² (1x) direct at switch rear-side connection |
