Siemens LD63B450 Molded Case Circuit Breaker
- 450A
- 3 Pole
- Unit Mount
Siemens
LD63B450
Molded Case Circuit Breaker
Brand
Siemens
SKU
LD63B450
Quantity
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Siemens LD63B450 - 450A 3 Pole Molded Case Circuit Breaker
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Description
Built for industrial applications, the Siemens LD63B450 is a 450-amp, 3-pole molded case circuit breaker from the Sentron series. This unit-mount breaker is compatible with Siemens S1, S2, and SE panelboards. It also provides a seamless replacement for obsolete ITE LD3450 breakers in existing setups. Offering a 35 kAIC capacity at 480VAC, the LD-frame breaker includes an interchangeable trip unit with adjustable magnetic functions and comes standard with lugs.Specifications
| Brand | Siemens |
|---|---|
| Series | LD6 |
| Amperage | 450A |
| 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 | LD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (Type S1, S2, SE), Switchboards, Enclosures |
| 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 Lugs (TA2J6500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit, HACR Rated, Reverse Feed |
Product FAQs
6 answersWhat is the direct replacement for an obsolete ITE LD3450 circuit breaker?
The Siemens LD63B450 serves as a direct replacement for legacy ITE LD3450 450A breakers in existing panelboards and switchboards.
Is there a higher interrupting capacity alternative to the LD63B450?
Yes, the HLD63B450 is the high interrupting version of this breaker, offering a 65kAIC rating at 480VAC compared to the standard 35kAIC of the LD63B450.
Which lug kit is standard for the LD63B450 breaker?
This breaker typically uses the TA2J6500 line and load lug kit, which accepts two 3/0 AWG to 500 kcmil copper or aluminum wires per phase.
Which panelboards are compatible with the LD63B450?
This LD frame breaker is designed for use in Siemens Sentron Type S1, S2, and SE panelboards, as well as compatible switchboards and enclosures.
Can the trip settings on the LD63B450 be adjusted in the field?
Yes, this breaker features an interchangeable thermal magnetic trip unit with a fixed thermal element for overload protection and an adjustable magnetic function for short circuit protection.
What is the recommended testing procedure to verify the trip unit on the LD63B450?
Primary injection testing is the industry standard method to verify the time current curve and proper operation of the thermal magnetic trip unit before commissioning.
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