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Siemens JD23B250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Siemens
JD23B250
Molded Case Circuit Breaker
Brand
Siemens
SKU
JD23B250
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Siemens JD23B250 - 250A 3 Pole Molded Case Circuit Breaker
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Description
Operating within the Sentron family, the Siemens JD23B250 is a 250-amp molded case circuit breaker tailored for commercial power systems. It utilizes reliable thermal-magnetic trip technology to prevent overloads and short circuits. This three-phase breaker mounts into standard Siemens panelboards, enclosures, and switchboards. It is a match for legacy J-frame installations and is officially replaced by the JD63B250. Key specifications include a 65 kAIC rating at 240VAC.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JD23B250 |
| Series | JD2 |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 30kA @ 250VDC |
| Frame Type | JD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards, Switchboards, Motor Control Centers, Enclosures |
| Wire Gauge | (2) 3/0 AWG - 500 kcmil (Cu), (2) 4/0 AWG - 500 kcmil (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 | Lugs (TA2J6500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards and enclosures are compatible with the JD23B250 circuit breaker?
This JD frame breaker is designed for unit mounting in Siemens Sentron panelboards, switchboards, motor control centers, and standalone enclosures.
Can the Siemens JD23B250 replace older I-T-E circuit breakers with the same catalog number?
Yes, Siemens acquired I-T-E, and the current Siemens JD23B250 is a direct replacement for legacy I-T-E JD23B250 breakers. It fits the same physical footprint and mounting hardware.
What does the adjustable magnetic trip function on this breaker allow me to do?
The adjustable magnetic trip lets you fine-tune the instantaneous short-circuit pickup threshold. This is critical for achieving proper selective coordination with downstream devices and preventing nuisance tripping during motor inrush currents.
What do the LI trip functions indicate on the JD23B250?
The LI designation means the thermal-magnetic trip unit provides Long-Time (L) overload protection and Instantaneous (I) short-circuit protection. The thermal element is fixed, while the magnetic element is adjustable.
How many conductors can the standard lugs on the JD23B250 accommodate?
The standard lugs are designed for dual conductors per phase. They accept two copper wires ranging from 3/0 AWG to 500 kcmil, or two aluminum wires ranging from 4/0 AWG to 500 kcmil.
What safety procedures are required when installing this bolt-on MCCB?
Always de-energize the panelboard or switchboard before installation. Verify zero voltage using a properly rated multimeter, follow standard lockout and tagout procedures, and ensure the adjustable magnetic trip is set according to your coordination study before energizing the circuit.
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