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Siemens JD23B350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Siemens
JD23B350
Molded Case Circuit Breaker
Brand
Siemens
SKU
JD23B350
Quantity
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Siemens JD23B350 - 350A 3 Pole Molded Case Circuit Breaker
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Description
The JD23B350 is a 350-amp molded case circuit breaker designed for commercial and industrial power distribution. It mounts into Siemens Sentron panelboards, switchboards, and motor control centers to deliver robust circuit protection. As a legacy J-Frame model, it serves as a reliable replacement for older installations and is superseded by the JD63B350. Rated for 65 kAIC at 240VAC, this bolt-on breaker features an interchangeable trip unit with adjustable magnetic settings and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Series | JD2 |
| Amperage | 350A |
| 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/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, Padlock Attachment, Motor Operator, Rotary Handle, Lug Kits |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, IEC 60947-2, NEMA AB 1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit |
Product FAQs
5 answersWhat equipment is compatible with the JD23B350 breaker?
This JD frame breaker is designed for bolt-on installation in Siemens Sentron panelboards, switchboards, motor control centers, and standalone enclosures.
What are the lug wire size requirements for this 350A breaker?
The standard lugs accept two conductors per phase, ranging from 3/0 AWG to 500 kcmil. They are rated for both copper and aluminum wiring.
How does the adjustable trip function work on the JD23B350?
This breaker uses a thermal-magnetic trip unit. The thermal element provides fixed long-time overload protection, while the magnetic element allows you to adjust the instantaneous short-circuit trip threshold to coordinate with downstream devices.
Will this breaker arrive with ITE or Siemens branding?
Siemens acquired ITE and continued manufacturing the same legacy MCCB designs. Depending on the exact production run, the JD23B350 may feature either ITE or Siemens labeling, but both are physically and electrically identical.
Is the JD23B350 suitable for direct current systems?
Yes, in addition to its standard AC ratings, this breaker is rated for use in DC applications up to 250VDC with a maximum interrupting capacity of 30kA.
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