Siemens JJ63B400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Bolt-On
Quantity
Siemens JJ63B400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for commercial applications, the Siemens JJ63B400 is a 3-pole, 400A molded case circuit breaker. It operates at up to 600VAC, delivering robust thermal-magnetic protection. This bolt-on unit installs into Siemens P4 and P5 panelboards or switchboards. As a legacy component, it serves as an exact replacement for older setups and is succeeded by the JXD63B400. Rated at 65kAIC at 240VAC, it features fixed thermal and adjustable magnetic trip settings, plus a HACR rating for HVAC equipment.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JJ63B400 |
| Series | JJ |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 10kA @ 600VAC, 25kA @ 250VDC |
| Frame Type | JJ63 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| Wire Gauge | 3/0 AWG - 500 kcmil (Al/Cu) |
| 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, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5.1, NEMA AB-1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit |
Product FAQs
6 answersWhich panelboards are compatible with the Siemens JJ63B400?
This bolt-on J-frame circuit breaker is designed for installation in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards and older ITE enclosures.
Is the Siemens JJ63B400 still manufactured, or is there a direct replacement?
The JJ63B400 is a legacy, discontinued component. For new installations or direct replacements, the Siemens JD63B400 (interchangeable trip) or JXD63B400 (non-interchangeable trip) are the current succeeding models.
Which lug kit is required for the JJ63B400 breaker?
The standard lug kit for this 400A J-frame breaker is the TA2J6500, which accepts aluminum or copper wire ranging from 3/0 AWG to 500 kcmil.
Is the JJ63B400 suitable for use with heating and air conditioning equipment?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires this specific certification.
Does the JJ63B400 feature an interchangeable trip unit?
Yes, the standard JJ63B400 features an interchangeable thermal-magnetic trip unit. This allows the trip unit to be replaced or upgraded without removing the entire breaker frame.
Can the Siemens JJ63B400 be reverse fed?
Yes, standard JJ63B400 breakers can be reverse fed. However, breakers specifically marked with LINE and LOAD designations on the casing must be wired directionally and cannot be reverse fed per UL 489 standards.
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