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3WL1240-2FB77-4GA4-ZK07+R21+T40

The 3WL1240-2FB77-4GA4-ZK07+R21+T40 is a fully configured 400A air circuit breaker (ACB) from Siemens' Sentron 3WL series, designed for primary power distribution in industrial and commercial applications. This complete package includes advanced protection and monitoring capabilities.

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TEL：400-887-3214
Mail：jilineasyyi@outlook.com
Q Q：615739355
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Base Unit: 3WL1240-2FB77-4GA4
Parameter Specification
Type Air Circuit Breaker (ACB)
Rated Current (Iu) 400A
Poles 3P
Rated Voltage (Ue) 690V AC
Rated Insulation Voltage (Ui) 1000V
Rated Frequency 50/60Hz
Breaking Capacity (Icu @400V) 65kA
Mechanical Life 20,000 operations
Electrical Life 5,000 operations
Mounting Fixed/Withdrawable
Protection Degree IP40 (front)
Trip Unit: ZK07
Parameter Specification
Type Electronic Trip Unit
Protection Functions LSI (Long-time/Short-time/Instantaneous)
Ground Fault Protection Via R21 module
Communication PROFIBUS DP/Modbus RTU
Display LCD with measurement values
Measured Values Current, Voltage, Power, Energy
Setting Ranges Ir: 0.4-1×In (200-400A)
Accessory: R21
Parameter Specification
Type Ground Fault Protection Module
Sensitivity 30mA to 3A adjustable
Time Delay 0-1s adjustable
Alarm Contacts 1NO+1NC
Accessory: T40
Parameter Specification
Type Current Transformer Set
Ratio 40:5 (for 400A breaker)
Accuracy Class 1%
Burden 5VA
Mechanical Data
Parameter Specification
Dimensions (W×H×D) 252×275×155 mm
Weight Approx. 18kg
Connection Top/bottom feed
Environmental Conditions
Parameter Specification
Operating Temperature -5°C to +55°C
Storage Temperature -40°C to +85°C
Humidity ≤95% RH
Standards Compliance
IEC 60947-2

UL 1066

GB 14048.2

CE, cULus

Communication Protocols
PROFIBUS DP (via ZK07)

Modbus RTU (via ZK07)

Note: This configuration represents a complete 400A circuit breaker solution with:

Base breaker frame

Intelligent trip unit

Ground fault protection

Current transformers