Siemens / ITE LL63B500 Molded Case Circuit Breaker
- 500A
- 3 Pole
- Unit Mount
Quantity
Siemens / ITE LL63B500 - 500A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the Sentron L-Frame series, this 500A molded case circuit breaker delivers reliable long-time and instantaneous (LI) protection for commercial applications. It utilizes a thermal-magnetic trip unit to safeguard heavy-duty electrical systems. Designed for unit-mount configurations, the breaker fits into Siemens P4 and P5 panelboards. It is an exact legacy replacement that requires no adapters, and can be substituted with the LD63B500. The unit features a 65kAIC rating at 240V.Specifications
| Brand | Siemens / ITE |
|---|---|
| Series | LL |
| Amperage | 500A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | LL63 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| Wire Gauge | (2) 3/0 AWG-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 |
|---|---|
| Accessories | Line and Load Side Lugs (TA2J6500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Interchangeable Trip Unit |
Product FAQs
7 answersWhich Siemens panelboards are compatible with the LL63B500?
This L-frame breaker is designed for use in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards. It requires the appropriate strap kit or mounting hardware specific to the panel type for a secure bolt-on installation.
What are the acceptable wire sizes for the lugs on this breaker?
The standard factory lugs are designed to accept two conductors per phase. They accommodate wire sizes ranging from 3/0 AWG up to 500 kcmil for both copper and aluminum conductors.
How is the trip unit configured on the LL63B500?
It features a thermal-magnetic trip unit with a fixed thermal element for 500A continuous overload protection and an adjustable magnetic element. The adjustable magnetic dial allows electricians to fine-tune the instantaneous short-circuit trip threshold based on specific load requirements.
Is this breaker suitable for direct current systems?
Yes, it is rated for DC applications up to 500VDC, providing an interrupting capacity of 25kA at that voltage. This makes it suitable for specific industrial DC control panels and legacy solar applications.
Is the ITE LL63B500 still actively manufactured?
This is a legacy molded case circuit breaker originally manufactured under the ITE and early Siemens brands. While it is part of the older L-frame family, it remains a direct bolt-on replacement for existing installations, allowing you to maintain older equipment without requiring full panel upgrades.
Can this unit mount breaker be used as a main breaker?
Yes, it can serve as a main or branch breaker in compatible switchboards and panelboards, provided the enclosure and busbars are rated for at least 500A and the correct mounting hardware is utilized.
What is the significance of the 35kAIC rating at 480V?
The 35kA interrupting capacity indicates the maximum fault current the breaker can safely clear at 480VAC without sustaining catastrophic damage. You must verify that your system's available fault current does not exceed this value at the point of installation to ensure compliance with electrical codes.
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