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Siemens HQJ23B100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Siemens
HQJ23B100
Molded Case Circuit Breaker
Brand
Siemens
SKU
HQJ23B100
Quantity
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Siemens HQJ23B100 - 100A 3 Pole Molded Case Circuit Breaker
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Description
A direct fit for commercial and industrial electrical systems, this 3-pole, 100A molded case circuit breaker provides reliable overcurrent protection. It mounts into Siemens P1, P2, and P3 panelboards, switchboards, and meter centers. Featuring a 65kAIC interrupting rating at 240VAC, the HQJ23B100 utilizes standard thermal-magnetic trip technology. Note that this legacy QJ-frame model has been replaced by the newer QR-frame HQR23B100.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HQJ23B100 |
| Series | HQJ |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1, P2, P3 Panelboards, Switchboards, Meter Centers, Motor Control Centers |
| Wire Gauge | 6 AWG - 300 kcmil (Cu), 4 AWG - 300 kcmil (Al) |
| Max Wire | 300 kcmil |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Line & Load Lugs |
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Common Trip, Extra High Interrupting Capacity |
Product FAQs
8 answersIs the Siemens HQJ23B100 still in active production?
No, the HQJ23B100 is a legacy QJ-frame circuit breaker. Siemens has replaced it with the newer QR-frame equivalent, catalog number HQR23B100, which offers the same 100A, 3-pole configuration for P-series panelboards.
What is the difference between the QJ23B100, QJH23B100, and HQJ23B100?
While all three are 100A, 3-pole, bolt-on QJ-frame breakers, they differ in their short-circuit interrupting ratings. The QJ23B100 is the standard interrupting version, the QJH23B100 is the high interrupting version, and the HQJ23B100 provides extra-high interrupting capacity.
How do you decode the HQJ23B100 catalog number?
The "HQJ" prefix indicates the extra-high interrupting QJ-frame. The first number "2" designates a 240V rating, the "3" stands for 3-pole, the "B" means it is a bolt-on breaker for panelboards, and "100" represents the 100A rating.
Does the HQJ23B100 come with line and load lugs?
The "B" in the HQJ23B100 catalog number indicates it is a bolt-on breaker. It is designed to bolt directly to the panelboard bus on the line side and includes lugs on the load side for wire connections.
Are the dimensions of the HQJ23B100 the same as the standard QJ23B100?
Yes, all Siemens QJ-frame breakers, including the QJ23B100, QJH23B100, and HQJ23B100, share the same physical dimensions and mounting footprint. This allows them to be swapped without modifying the panel space, provided the interrupting rating meets your system requirements.
Can I adjust the trip settings on the HQJ23B100?
No, this breaker features a non-interchangeable thermal-magnetic trip unit. Both the long-time and instantaneous (LI) trip functions are factory set and cannot be adjusted in the field.
Is the HQJ23B100 suitable for HVAC applications?
Yes, Siemens QJ-frame breakers like the HQJ23B100 are HACR rated, meaning they are approved for use with heating, air conditioning, and refrigeration equipment.
Can the HQJ23B100 be reverse fed?
Yes, this breaker is suitable for reverse feed applications, allowing it to be wired with the line connections on the load side if required by your panel layout.
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