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Siemens NGG2B040L Molded Case Circuit Breaker
- 40A
- 2 Pole
- Unit Mount
Siemens
NGG2B040L
Molded Case Circuit Breaker
Brand
Siemens
SKU
NGG2B040L
Quantity
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Siemens NGG2B040L - 40A 2 Pole Molded Case Circuit Breaker
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Description
Belonging to the SENTRON family, the Siemens NGG2B040L is a 2-pole, 40A molded case circuit breaker. Engineered for commercial and industrial applications, this unit mount breaker provides robust overcurrent and short-circuit protection for control panels and switchboards. Designed for flexible installation, it mounts easily onto DIN rails or standard enclosures. This model serves as a direct replacement for older GB/GG frame units.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NGG2B040L |
| Series | NGG |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 120VAC, 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 125/250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 120VAC, 65kA @ 240VAC, 25kA @ 480Y/277VAC, 25kA @ 480VAC, 14kA @ 600Y/347VAC, 14kA @ 125/250VDC |
| Frame Type | NGG |
|---|---|
| Terminal Type | Lugs |
| For Use With | DIN Rail Enclosures, Control Panels, Switchboards |
| Wire Gauge | 8-1/0 AWG (Cu), 8-2/0 AWG (Al) |
| Max Wire | 1/0 AWG (Cu), 2/0 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Undervoltage Release, Padlock Attachment, Motor Operator, Rotary Handle, Nut Keeper Kit |
|---|---|
| Accessories | Line & Load Side Lugs (3TC1GG20) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, HACR, HID, NOM, UL |
| Temp Rating | 40C |
Product FAQs
9 answersHow is the Siemens NGG2B040L mounted?
This breaker features a unit mount, feed-thru design. It can be independently mounted on a standard DIN rail or secured in place using mounting screws within industrial control panels and switchboards. It does not plug into standard residential load center busbars.
What wire sizes are compatible with the lugs on this breaker?
The factory-installed lugs accept 8 to 1/0 AWG copper wire or 8 to 2/0 AWG aluminum wire.
Can the NGG2B040L be installed in a standard Siemens residential load center?
No. The NGG frame is a unit mount, feed-thru molded case circuit breaker designed for control panels, switchboards, and DIN rail enclosures. It is not compatible with the busbars of standard residential load centers.
Is this breaker suitable for direct current (DC) applications?
Yes, the NGG2B040L is rated for DC applications up to 125/250VDC with an interrupting capacity of 14kAIC, making it suitable for specific industrial DC control circuits.
What does the "L" suffix in the NGG2B040L catalog number indicate?
The "L" suffix indicates that the breaker is supplied with both line side and load side lugs as standard from the factory.
What is the short-circuit interrupting rating for this breaker on a 480V system?
The NGG2B040L has an interrupting capacity of 25kAIC at 480VAC. It is also rated for 25kAIC on 480Y/277VAC systems.
Can the NGG2B040L be reverse fed?
Yes, this Siemens NGG frame breaker features a non-interchangeable trip unit and is suitable for reverse feed applications according to UL 489 standards.
Is the NGG2B040L being phased out, and what is the recommended replacement?
Yes, Siemens is phasing out the NGG frame circuit breaker portfolio. The recommended successor for the NGG2B040L is the 3VA51 series, specifically catalog number 3VA5140-4ED26-0AA0. Always verify fit, form, and function for your specific application before upgrading.
What type of trip unit is installed in the NGG2B040L?
It features a non-interchangeable thermal magnetic trip unit with fixed thermal and fixed magnetic settings, providing long-time (L) and instantaneous (I) protection against overloads and short circuits.
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