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Siemens CJD63B300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Siemens
CJD63B300
Molded Case Circuit Breaker
Brand
Siemens
SKU
CJD63B300
Quantity
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Siemens CJD63B300 - 300A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty power distribution, the Siemens CJD63B300 is a 3-pole, 300A molded case circuit breaker. It belongs to the Sentron series and utilizes a rugged JD frame. This unit-mount breaker integrates into Siemens P4 and P5 panelboards, switchboards, and enclosures. It accommodates 3/0 AWG to 500 kcmil conductors. The fuseless, current-limiting architecture delivers a 200kAIC rating at 240VAC. It includes a thermal-magnetic trip unit with adjustable magnetic response (LI).Specifications
| Brand | Siemens |
|---|---|
| Series | CJD |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 150kA @ 480VAC, 100kA @ 600VAC, 50kA @ 500VDC |
| Frame Type | CJD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards, Enclosures |
| Wire Gauge | 3/0 AWG to 500 kcmil (Cu/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 Kits, Rotary Handle, Motor Operator |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, Non-Interchangeable Trip, Reverse Feed |
Product FAQs
4 answersWhich Siemens panelboards accept the CJD63B300 circuit breaker?
This JD-frame breaker is designed for installation in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards and standalone enclosures.
Can the CJD63B300 be used in direct current (DC) systems?
Yes, this breaker is rated for DC applications up to 500VDC, providing a 50kA interrupting capacity for DC circuits.
How is the thermal-magnetic trip unit configured on the CJD63B300?
It features a non-interchangeable trip unit with fixed thermal overload protection and an adjustable instantaneous magnetic trip. The magnetic trip can be dialed between 1250A and 2500A for precise short-circuit coordination.
How does the CJD63B300 differ from standard JD63B300 or HJD63B300 breakers?
The CJD63B300 is a current-limiting breaker with an ultra-high interrupting capacity of 150kAIC at 480V. The JD63B300 and HJD63B300 are standard and high-interrupting versions of the same frame, respectively, but lack the current-limiting breaking capacity of the CJD model.
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