Siemens 3VA2340-5HL32-0AA0 3-Pole 400A Circuit Breaker with ETU320

The 3VA2340-5HL32-0AA0 is a molded case circuit breaker from Siemens' 3VA2 series, designed for industrial and commercial power distribution. It is rated for 400 A continuous current at 50/60 Hz, with a breaking capacity of 55 kA at 415 VAC (IEC 60947-2). The device features an ETU320 electronic trip unit offering adjustable long-time, short-time, instantaneous, and ground-fault protection, making it suitable for main switchboards, motor control centers, and feeder circuits.

Electrical Specifications

• Number of Poles: 3

• Rated Current (In): 400 A (at 40°C ambient)

• Rated Operational Voltage (Ue): 690 VAC

• Impulse Withstand Voltage (Uimp): 8 kV

• Breaking Capacity (Icu): 55 kA at 415 VAC, 35 kA at 690 VAC

• Utilization Category: B (selective) with short-time delay

ETU320 Electronic Trip Unit

The ETU320 provides microprocessor-based protection with adjustable parameters:

• Long-time (L): I_r = 0.4–1 x In, t_r = 1–24 s (I²t or fixed time)

• Short-time (S): I_sd = 1.5–10 x I_r, t_sd = 0.1–0.5 s

• Instantaneous (I): I_i = 2–15 x In (or OFF)

• Ground-fault (G): I_g = 0.2–1 x In, t_g = 0.1–0.8 s (optional with external toroid)

The trip unit includes a LCD display showing current, trip history, and configuration. It also has a test port for use with Siemens' test kit.

Mechanical Features

The breaker has a rotary handle with three positions (ON/OFF/TRIPPED) and can be padlocked in OFF position. It accepts front-mounted auxiliary contacts (1 N.O. + 1 N.C.) and shunt trip or undervoltage release accessories. Terminals accept copper cables up to 240 mm². The device has an electrical life of 10,000 operations and mechanical life of 20,000.

Environmental and Certifications

Operating temperature: -25°C to +70°C (derate above 40°C). Storage: -40°C to +85°C. Protection class: IP20. The breaker meets IEC 60947-2, UL 489, and CCC standards. It is RoHS compliant and features Green Premium eco-label.

Applications

Used in main low-voltage switchgear, transformer secondary protection, and large motor circuits. The 3VA2340-5HL32-0AA0 is particularly suited for applications requiring selective coordination and high fault current capability.