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Siemens CJD63B350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Unit Mount
Siemens
CJD63B350
Molded Case Circuit Breaker
Brand
Siemens
SKU
CJD63B350
Quantity
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Siemens CJD63B350 - 350A 3 Pole Molded Case Circuit Breaker
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Description
Supplying robust overcurrent defense, the Siemens CJD63B350 is a 3-pole, 350A Sentron series MCCB. This breaker is engineered for demanding industrial environments. The JD-frame device is configured for unit mounting, fitting into Siemens P4 and P5 panelboards, switchboards, and enclosures. It accepts 3/0 AWG to 500 kcmil wiring. With a 200kAIC rating at 240VAC, it ensures exceptional safety. The thermal-magnetic trip provides fixed long-time and adjustable instantaneous (LI) protection.Specifications
| Brand | Siemens |
|---|---|
| Part Number | CJD63B350 |
| Series | CJD |
| Amperage | 350A |
| 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
7 answersWhich Siemens panelboards are compatible with the CJD63B350?
This JD frame breaker is designed for unit mounting in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards and enclosures. It is a large industrial breaker and will not fit in standard residential load centers.
What does the CJD prefix indicate on the CJD63B350?
The CJD prefix designates this as a fuseless, current-limiting molded case circuit breaker. It restricts let-through energy during a fault and offers a higher interrupting capacity than standard JD6 frame breakers.
What are the wire size requirements for the CJD63B350?
The standard lugs for this 350A breaker accept wire gauges from 3/0 AWG up to 500 kcmil. The terminals are rated for both copper and aluminum (Cu/Al) conductors.
How does the adjustable magnetic trip benefit the installation?
The CJD63B350 features a fixed thermal and adjustable magnetic (LI) trip unit. The adjustable magnetic setting allows electricians to tune the instantaneous trip threshold, which helps prevent nuisance tripping from high inrush currents when starting large motors.
Is the CJD63B350 rated for direct current (DC) systems?
Yes, in addition to its AC ratings, this thermal-magnetic breaker is rated for DC applications. It provides up to 50kAIC of interrupting capacity at 500VDC.
What type of connection is required to install the CJD63B350?
This is a unit-mount breaker that requires a bolt-on connection. It must be bolted directly to the buswork of a compatible panelboard or switchboard, ensuring a secure and high-capacity electrical connection.
What safety precautions apply when installing this 350A breaker?
Installation must be performed by a licensed electrician. Ensure all power is de-energized before bolting the breaker to the bus. Verify that the panelboard is rated for the high interrupting capacity and current-limiting characteristics of the CJD frame.
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