Siemens HNX3D120 Molded Case Circuit Breaker
- 1200A
- 3 Pole
- Unit Mount
Quantity
Siemens HNX3D120 - 1200A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for demanding industrial environments, the Siemens HNX3D120 is a 3-pole, 1200A molded case circuit breaker. It utilizes an advanced electronic trip unit with adjustable LSI settings to optimize system coordination. This unit-mount breaker installs into Siemens P4 and P5 panelboards or switchboards. It serves as a direct replacement for the legacy HNG3D120. Rated for 65kAIC at 480VAC, it delivers true RMS sensing and reliable H-Class interrupting performance.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HNX3D120 |
| Series | HNX |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC |
| Amperage Range | 480-1200A |
|---|
| Frame Type | HNX |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Communication Module |
|---|---|
| Accessories | Lugs Not Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, True RMS Sensing |
Product FAQs
5 answersWhich panelboards are compatible with the Siemens HNX3D120?
This unit mount circuit breaker is designed for installation in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards. Ensure your specific enclosure is rated to accept a 1200A ND frame footprint.
What adjustments are available on the LSI electronic trip unit?
The LSI designation indicates that the electronic trip unit features adjustable Long-Time, Short-Time, and Instantaneous pickup and delay settings. This allows electricians to precisely match the breaker's trip curve to the specific coordination requirements of the electrical system.
Can the HNX3D120 be used to replace older Siemens breakers?
Yes, the HNX3D120 serves as a direct replacement for the legacy Siemens HNG3D120 circuit breaker. It delivers true RMS sensing and reliable H-Class interrupting performance.
What are the safety benefits of the electronic trip unit on this breaker?
The electronic trip unit provides highly accurate protection and true RMS sensing. By allowing precise LSI adjustments, it improves selective coordination, ensuring that only the breaker closest to a fault trips. This minimizes power outages in other parts of the facility and helps reduce potential arc flash hazards.
What type of connections are required for installing the HNX3D120?
The breaker utilizes a bolt-on connection for secure mounting to the busbar in unit mount configurations. It is equipped with lug terminals for terminating the large conductors required for a 1200A circuit. Always verify torque requirements on the physical breaker label during installation.
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