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Siemens JL63B300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Bolt-On
Siemens
JL63B300
Molded Case Circuit Breaker
Brand
Siemens
SKU
JL63B300
Quantity
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Siemens JL63B300 - 300A 3 Pole Molded Case Circuit Breaker
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Description
The JL63B300 is a 3-pole, 300A molded case circuit breaker designed for commercial power distribution. As a legacy J-Frame unit, it provides robust thermal-magnetic trip functions with adjustable magnetic settings. This bolt-on breaker fits into Siemens P2, P3, P4, and P5 panelboards, as well as older ITE enclosures. It serves as a replacement for aging infrastructure and is superseded by the JD63B300. Rated for 65kAIC at 240VAC, it ensures reliable fault interruption and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JL63B300 |
| Series | JL |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | JL63 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P2, P3, P4, P5 Panelboards, Legacy ITE Panelboards |
| Wire Gauge | 3/0 AWG - 500 kcmil |
| 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, Motor Operator, Rotary Handle, Mechanical Lug Kits |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5, NEMA AB-1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit, Trip-Free Mechanism |
Product FAQs
6 answersWhich panelboards are compatible with the JL63B300 breaker?
This bolt-on breaker is designed for use in Siemens P2, P3, P4, and P5 panelboards, as well as legacy ITE panelboards that accept J-frame breakers.
What are the acceptable wire sizes for the lugs on this breaker?
The included lugs accept wire gauges ranging from 3/0 AWG to 500 kcmil. Ensure proper torque specifications are followed during installation.
How is the trip unit configured on the JL63B300?
It features a thermal-magnetic trip unit with fixed thermal protection for overloads and an adjustable magnetic setting for instantaneous short-circuit protection.
Can this breaker be used in DC applications?
Yes, it is rated for use in DC systems up to 500VDC, providing a maximum interrupting capacity of 25kA at that voltage.
Is the JL63B300 part of a current Siemens product line?
This unit is classified as a legacy molded case circuit breaker. It was originally manufactured under the ITE and Siemens brands for older J-frame applications.
Does this breaker require a specific mounting hardware kit?
As a bolt-on breaker, it requires the appropriate strap kit or mounting hardware specific to the Siemens or ITE panelboard series being used.
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