Siemens HHJD63B300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Quantity
Siemens HHJD63B300 - 300A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built to handle heavy-duty loads, the Siemens HHJD63B300 is a 3-pole, 300A molded case circuit breaker from the Sentron series. It utilizes a robust JD frame architecture to deliver consistent thermal-magnetic protection in industrial environments. This breaker installs into Siemens Sentron P4 and P5 panelboards and motor control centers. It features a unit mount design and includes TA2J6500 lugs. Delivering 100 kAIC at 480VAC, it features an interchangeable trip unit for system coordination.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HHJD63B300 |
| Series | HHJD |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC |
| Frame Type | HHJD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (Type P4, P5), Switchboards, Enclosures, Motor Control Centers |
| Wire Gauge | 3/0 AWG - 500 kcmil (Cu), 4/0 AWG - 500 kcmil (Al) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| 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, Lug Kit (TA2J6500) |
|---|---|
| Accessories | Line & Load Side Lugs (TA2J6500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Extra High Interrupting Capacity, HACR Rated, Interchangeable Trip Unit, Trip-Free Mechanism |
Product FAQs
5 answersWhich Siemens panelboards are compatible with the HHJD63B300 circuit breaker?
This unit-mount breaker is designed for use in Siemens Sentron Type P4 and P5 panelboards, as well as compatible Siemens switchboards and motor control centers.
What does the HHJD prefix indicate compared to standard JD frame breakers?
The HHJD prefix designates an extra-high interrupting rating. While standard JD breakers offer lower fault current protection, the HHJD63B300 provides up to 200kAIC at 240VAC and 100kAIC at 480VAC for systems with high available fault currents.
Are the trip settings adjustable on the HHJD63B300?
The thermal overload protection is fixed at 300 amps. However, the magnetic instantaneous trip is adjustable, allowing electricians to fine-tune short-circuit response and coordinate with downstream devices.
What wire sizes are accepted by the standard lugs on this breaker?
The factory-installed lugs accept 3/0 AWG to 500 kcmil copper conductors or 4/0 AWG to 500 kcmil aluminum conductors. Ensure proper torque specifications are followed during installation as outlined on the breaker faceplate.
Can I use the HHJD63B300 to replace an older JD63B300 or HJD63B300?
Yes, the HHJD63B300 shares the same physical dimensions and mounting footprint as the standard JD and high-interrupting HJD frames. It can safely replace them, providing an upgraded interrupting capacity.
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