Siemens
Siemens NGB3B020 Miniature Circuit Breaker — 20A 240V AC
Siemens NGB3B020 3-Pole Miniature Circuit Breaker (MCB)
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12-month warranty
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Same-day dispatch
Order by 2pm CST
Worldwide delivery
US, EU, Asia, Middle East
Veteran-owned
CAGE: 9NK75
20A current rating
Three-pole isolation
Thermal-magnetic protection
DIN rail compatible
Robust construction
Product description
The Siemens NGB3B020 is a three-pole miniature circuit breaker designed for comprehensive overcurrent protection in AC circuits. It is rated for 20A and operates at up to 240V AC, featuring a reliable thermal-magnetic trip mechanism.
This 3-pole breaker is ideal for applications requiring protection for three-phase loads or for situations where isolating all three phases simultaneously is necessary. It's commonly used in industrial control panels and machinery.
Stanlo Automation, your trusted veteran-owned source for surplus industrial automation parts, offers the Siemens NGB3B020. We ensure you get the parts you need to minimize downtime.
Technical specifications
| Voltage | 240V AC |
| Current | 20A |
| Poles | 3 |
| Trip Type | Thermal-Magnetic |
| Series | NGB |
| Mounting | DIN Rail |
Common applications
Three-phase motor circuits
Industrial control panels
Machine protection
Electrical distribution
Load isolation
Compatible systems
Three-phase AC power systems
Standard DIN rail mounting
Also known as
Siemens NGB3B020 breaker
NGB3B020 MCB
Siemens 20A 3-pole breaker
NGB 3-pole 20A
Replaces / compatible with
This 3-pole circuit breaker from the Siemens NGB series offers reliable protection for circuits requiring simultaneous switching of three conductors.
Technical note
Expert tip
For three-phase motor applications, ensure the breaker's interrupting rating is sufficient for the prospective short-circuit current at the point of installation.What happens next?
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Frequently asked questions
Can the Siemens NGB3B020 be used for single-phase applications?
Yes, while designed as a 3-pole breaker, the Siemens NGB3B020 can be used for single-phase applications where a higher degree of safety or future expansion is desired, by utilizing two poles and leaving one spare or by connecting all three poles in parallel for specific configurations if permitted by code.