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Siemens HQR23B250H Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Siemens
HQR23B250H
Molded Case Circuit Breaker
Brand
Siemens
SKU
HQR23B250H
Quantity
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Siemens HQR23B250H - 250A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty industrial applications, this 250-amp Sentron series MCCB delivers an exceptional 100kAIC interrupting capacity at 240VAC. The bolt-on configuration integrates perfectly with Siemens P1, P2, and P3 panelboards, as well as compatible switchboards and meter centers. Designed to replace older FD frame units, it offers fixed thermal and magnetic trip functions for precise LI protection. The reverse-feed compliant design includes factory-installed load side lugs for fast wiring.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HQR23B250H |
| Series | HQR |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1, P2, P3 Panelboards, Switchboards, Meter Centers |
| Wire Gauge | 3 AWG - 300 kcmil (Al/Cu) |
| Max Wire | 300 kcmil |
| Min Wire | 3 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Reverse Feed, Push-to-Trip, Non-Interchangeable Trip, Extra High Interrupting Capacity |
Product FAQs
9 answersWhich Siemens panelboards accept the HQR23B250H circuit breaker?
The HQR23B250H is designed for bolt-on installation in Siemens P1, P2, and P3 panelboards. It is also compatible with Siemens switchboards and meter centers configured to accept QR frame breakers.
What wire sizes and materials are compatible with the standard lugs on this breaker?
The factory-installed lugs accept both aluminum and copper conductors ranging from 3 AWG to 300 kcmil. Ensure proper torque specifications are followed during installation.
Can the HQR23B250H be installed in systems requiring a 65kA short-circuit rating?
Yes. With a maximum interrupting rating of 100kA at 240V AC, this breaker safely exceeds the requirements for systems specifying 10kA, 22kA, 65kA, or any other fault current up to 100kA.
How is the HQR23B250H mounted into the electrical enclosure?
This is a bolt-on circuit breaker. It secures directly to the panelboard bus using bolted connections, which provides a rigid, high-vibration-resistant contact for commercial and industrial power distribution.
What frame class does the HQR23B250H belong to?
This breaker is part of the Siemens QR frame family. It shares physical dimensions and accessory compatibility with other QJ and QR series molded case circuit breakers.
Does the HQR23B250H feature an adjustable trip unit?
No. This breaker is equipped with a fixed thermal-magnetic trip unit. It provides Long-Time and Instantaneous (LI) protection calibrated to a strict 250A limit that cannot be adjusted in the field.
What is the standard ambient operating temperature for this breaker?
The thermal-magnetic trip unit in the HQR23B250H is calibrated for a standard ambient operating temperature of 40 degrees Celsius (104 degrees Fahrenheit).
Are replacement lug kits available for the HQR23B250H?
Yes. If field replacement is necessary, you can use Siemens lug kit 3TA1QR300, which includes three aluminum terminals designed specifically for QR frame breakers and accepts conductors up to 300 kcmil.
How does the thermal-magnetic trip mechanism protect the circuit?
The thermal component provides long-time delay protection against sustained overloads, preventing wire overheating. The magnetic component provides instantaneous tripping to safely clear severe short-circuit faults up to 100kA.
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