DW air circuit breakers (ACB) 800–6300 A, up to 150 kA

Country: Japan · Model: DW

Air circuit breakers (ACB) rated 800–6300 A in two frame sizes and 11 types, with a breaking capacity up to 150 kA at 440 V. They are installed on the incomers of main switchboards and on sectional and outgoing lines of high power. Each breaker has an electronic trip unit.

Frame sizes: 2 frames, 11 types: 800–4000 A and 4000–6300 A
Breaking capacity DW08–DW40: 440 V / 65 kA (H1), 440 V / 100 kA (H2)
Breaking capacity DW40b–DW63: 440 V / 100 kA (H1), 440 V / 150 kA (H2)
Trip unit: from basic (overcurrent protection) to extended with measurements, programmable functions and communication

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Technical specifications

Frame sizes	2 frames, 11 types: 800–4000 A and 4000–6300 A
Breaking capacity DW08–DW40	440 V / 65 kA (H1), 440 V / 100 kA (H2)
Breaking capacity DW40b–DW63	440 V / 100 kA (H1), 440 V / 150 kA (H2)
Trip unit	from basic (overcurrent protection) to extended with measurements, programmable functions and communication
Protections	long-time and short-time delay, instantaneous, ground fault, leakage
Measurements	current, energy, harmonics; event log, alarms
Standards	IEC 60947-1, IEC 60947-2; tropical version per IEC 60068-2-30

Specifications are taken from the manufacturer’s technical documentation. Updated 11/09/2026.

Description

The first frame covers 800–4000 A, the second 4000–6300 A. The breaking capacity has two levels, H1 for sites with high short-circuit currents or two transformers working in parallel and H2 for heavy industry with very high short-circuit currents. For DW08–DW40 at 440 V this is 65 kA (H1) and 100 kA (H2), for DW40b–DW63 100 kA (H1) and 150 kA (H2) respectively. The draw-out version, selectivity and low maintenance are retained. The electronic unit ranges from a basic version with overcurrent protection to an extended one with measurement and programmable functions. Protections with long-time and short-time delay, instantaneous, ground fault and leakage are available, as well as measurement of current, energy and harmonics. The unit logs events, issues alarms and communicates with a supervisory system, and has navigation buttons and an LCD display. The main terminals can be connected in different ways. The breakers comply with IEC 60947-1 and IEC 60947-2 and have a tropical version.

How to choose

The choice starts with the rated current and the short-circuit current at the installation point. Up to 4000 A the first frame is suitable, above that up to 6300 A the second. The H1 level is appropriate for plants with a high short-circuit current or two parallel transformers, and H2 is needed in heavy industry. Places of use are main switchboards of industrial plants, data centers, buildings, 0.4 kV substations and the auxiliaries of power plants. For lower currents of 32–800 A look at the molded-case G-TWIN.

Request a price and lead time

DW air circuit breakers (ACB) 800–6300 A, up to 150 kA. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

What is the breaking capacity of the DW series ACB?

At 440 V for DW08–DW40 it is 65 kA (H1) and 100 kA (H2), for DW40b–DW63 100 kA (H1) and 150 kA (H2) respectively.

What rated currents does the DW series have?

The series has 11 types in two frame sizes, 800–4000 A and 4000–6300 A.

What protections does the DW electronic unit have?

Long-time and short-time delay, instantaneous protection, ground fault and leakage protection. The extended unit also measures current, energy and harmonics and keeps an event log.

Which standards do the DW breakers meet?

IEC 60947-1 and IEC 60947-2. The tropical version is tested per IEC 60068-2-30.

Do the DW breakers have a draw-out version?

Yes, the draw-out version is retained, together with the selectivity and low maintenance traditional for ACB.