Siemens SENTRON ACB – Microprocessor Based Trip Unit – 3WA1108-2AF42-4EA4
The Siemens 3WA1108-2AF42-4EA4 is a SENTRON 3WA series Air Circuit Breaker (ACB) equipped with a microprocessor-based electronic trip unit (ETU). It is designed for high-capacity low-voltage power distribution systems where reliable protection, advanced monitoring, and high selectivity are required.
This ACB is used in main incoming feeders, power distribution panels, industrial plants, data centers, and critical infrastructure systems, ensuring safe interruption of high fault currents and enhanced system stability.
Key Features
• Siemens SENTRON 3WA series Air Circuit Breaker (ACB)
• Part Number: 3WA1108-2AF42-4EA4
• Microprocessor-based Electronic Trip Unit (ETU)
• Provides advanced protection functions:
o Overload protection (L)
o Short-circuit protection (S & I)
o Ground fault protection (G)
• High breaking capacity for industrial power systems
• Designed for selective coordination in LV networks
• Suitable for withdrawable/ fixed switchgear systems (variant dependent)
• Supports digital monitoring and system integration (depending on ETU configuration)
• Modular SENTRON 3WA platform for flexible upgrades
• Complies with IEC 60947-2 standards
|
Parameter |
Specification |
|
Product Series |
Siemens SENTRON 3WA |
|
Part Number |
3WA1108-2AF42-4EA4 |
|
Product Type |
Air Circuit Breaker (ACB) |
|
Trip Unit Type |
Microprocessor-based ETU |
|
Rated Current (Frame) |
800 A class (3WA1 size range) |
|
Protection Functions |
L / S / I / G (configurable) |
|
Breaking Capacity |
Up to 55 kA @ 500 V AC (series dependent) |
|
Standards |
IEC 60947-2 |
|
Application Voltage |
Low-voltage distribution (up to 690V AC typical) |
|
Mounting Type |
Fixed / Withdrawable (variant dependent) |
|
Application |
Main incomer, LT panels, MCC/PCC, industrial distribution |
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