Siemens HNX3B120 Molded Case Circuit Breaker
- 1200A
- 3 Pole
- Unit Mount
Quantity
Siemens HNX3B120 - 1200A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Quantity
Siemens HNX3B120 - 1200A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | HNX3B120 |
| Series | HNX |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC |
| Frame Type | HNX |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Handle Tie |
|---|---|
| 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, Reverse Feed |
Quantity
Siemens HNX3B120 - 1200A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | HNX3B120-R |
| Series | HNX |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC |
| Frame Type | HNX |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Handle Tie |
|---|---|
| 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, Reverse Feed |
Description
The HNX3B120 is a high-capacity molded case circuit breaker designed for demanding industrial power distribution. Operating at 1200A, it provides robust overcurrent protection. This unit mount breaker fits into Siemens P4 and P5 panelboards and switchboards. It features an NG frame footprint and serves as a reliable component for facility upgrades. Rated 65 kAIC at 480VAC, the device utilizes a thermal-magnetic trip unit with fixed thermal and adjustable magnetic settings (LI functions).Specifications
| Brand | Siemens |
|---|---|
| Part Number | HNX3B120-R |
| Series | HNX |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC |
| Frame Type | HNX |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Handle Tie |
|---|---|
| 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, Reverse Feed |
Product FAQs
6 answersWhich Siemens panelboards accept the HNX3B120 circuit breaker?
This unit-mount breaker is compatible with Siemens P4 and P5 panelboards, as well as Siemens switchboards designed to accept ND frame breakers.
How does the thermal magnetic trip unit operate on the HNX3B120?
The LI trip unit provides Long-Time (L) protection using a fixed thermal element for continuous overloads, combined with an adjustable magnetic element for Instantaneous (I) short-circuit protection.
What is the mounting configuration for this 1200A breaker?
The HNX3B120 utilizes a bolt-on connection for unit mounting. This ensures a secure, vibration-resistant attachment to the busbars in high-capacity panelboards and switchboards.
Can this breaker be used to upgrade older I-T-E or Siemens installations?
Yes, the HNX3B120 can replace legacy Siemens and I-T-E 1200A breakers within the ND frame group, provided the existing enclosure and bus structure support the HNX frame footprint and bolt-on mounting.
How does the interrupting capacity scale with system voltage on the HNX3B120?
The breaker provides a maximum interrupting rating of 100kAIC on 240V AC systems. This rating decreases at higher voltages, offering 65kAIC at 480V AC and 35kAIC at 600V AC.
What are the primary safety requirements for installing the HNX3B120?
Installation must be performed by a qualified electrician. Before mounting, verify that the available fault current does not exceed the breaker's maximum interrupting rating for your system voltage, and ensure all power is disconnected.
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