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Siemens LGG3B020L Molded Case Circuit Breaker
- 20A
- 3 Pole
- Unit Mount
Siemens
LGG3B020L
Molded Case Circuit Breaker
Brand
Siemens
SKU
LGG3B020L
Quantity
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Siemens LGG3B020L - 20A 3 Pole Molded Case Circuit Breaker
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Description
Designed for precise coordination, the Siemens LGG3B020L is a 3-pole, 20A molded case circuit breaker. Unlike standard fixed-trip models, it features a fixed thermal and adjustable magnetic trip unit, allowing engineers to fine-tune instantaneous (LI) protection. The unit-mount configuration easily installs into industrial control panels, switchboards, enclosures, and onto DIN rails. It comes equipped with line and load side lugs.Specifications
| Brand | Siemens |
|---|---|
| Part Number | LGG3B020L |
| Series | LGG |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 125VDC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 14kA @ 600Y/347VAC, 14kA @ 125VDC, 14kA @ 250VDC |
| Frame Type | LGG |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Enclosures, Industrial Control Panels, Switchboards, DIN Rail |
| Wire Gauge | 14-6 AWG (Cu), 12-6 AWG (Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Line & Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, NOM, UL |
| Temp Rating | 40C |
Product FAQs
6 answersHow does the LGG3B020L mount inside a control panel?
This unit-mount breaker can be base-mounted to a panel backplate using screws or snapped directly onto a standard 35mm DIN rail without requiring additional mounting adapters.
What does the L suffix in the LGG3B020L catalog number indicate?
The L at the end of the part number indicates that the breaker is supplied with factory-installed lugs on both the line and load sides.
Can the Siemens LGG3B020L be reverse fed?
Yes. Because this breaker features a non-interchangeable thermal-magnetic trip unit, it is UL 489 listed for reverse feeding, allowing power to be supplied from either the line or load side.
How is the trip unit configured on this LGG frame breaker?
It features a thermal-magnetic trip unit with Long-Time and Instantaneous (LI) protection. The thermal overload protection is fixed, while the instantaneous magnetic short-circuit trip is adjustable.
Which Siemens breaker family does the LGG3B020L belong to?
It is part of the Siemens SENTRON family and falls under the GB/GG frame group. This compact industrial design shares a footprint with other GG frame breakers for straightforward panel integration.
Does this breaker feature a trip-free mechanism?
Yes. The Siemens GG frame utilizes an over-center toggle mechanism that is trip-free. If a short circuit or overload occurs, the contacts will be forced apart and the breaker cannot be held closed by the handle.
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