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