Description

GYW1 Air Circuit Breaker Overview

The GYW1 air circuit breaker (ACB) is a universal-type circuit breaker rated 200A to 6300A, designed for AC 50Hz distribution networks with rated voltages up to AC 400V/690V. It is mainly used for power distribution, protecting circuits and power supply equipment against overload, undervoltage, short circuit and single-phase grounding faults. Under normal conditions, it can also serve for infrequent circuit switching. Available in 3-pole and 4-pole versions with fixed or drawer-type installation, the GYW1 ACB integrates an intelligent controller with a communication interface for remote monitoring and automation systems.

Working Principle

The GYW1 monitors the main circuit through its intelligent controller. When the current or voltage exceeds preset protection thresholds, the release mechanism trips the breaker, disconnecting the circuit. Its selective protection logic coordinates with downstream devices, isolating only the faulty section to maintain power supply continuity and avoid unnecessary outages. Total breaking time is ≤30ms (without intentional delay) and closing time is ≤70ms.

Key Features

Wide current range — 6 frame sizes covering 200A to 6300A.
Intelligent protection — accurate selective protection improves power supply reliability.
Communication interface — open communication port supports “four remote” functions (remote monitoring, metering, control, adjustment) for control centers and automation systems.
High breaking capacity — Icu up to 120kA at AC 380/400/415V; H-type versions available for enhanced ratings.
Long service life — mechanical life up to 30,000 operations (with maintenance); electrical life up to 7,000 operations at AC 415V.
Zero arcing distance — compact and safe cabinet installation.
Flexible configuration — 3P/4P, fixed or drawer type, manual or motorized operation, with optional undervoltage release, key locks and mechanical interlocks.

Protection Functions

Overload protection — safeguards lines and equipment from sustained overcurrent.
Undervoltage protection — optional undervoltage release (design code 1).
Short-circuit protection — rated short-time withstand current Icw/1s up to 100kA.
Single-phase grounding fault protection — reduces grounding fault hazards.
Selective protection — coordinated tripping avoids unnecessary power outages.

Installation Conditions

Ambient temperature: -5°C to +40°C, 24h average ≤+35°C; derating applies above +40°C (up to +65°C max). Low-temperature versions available on request.
Altitude: ≤2000m; derating factors apply above 2000m up to 5000m.
Humidity: ≤50% RH at 40°C max; higher humidity permitted at lower temperatures (e.g. 90% at 20°C).
Pollution degree: Level 3; Selectivity category: Class B.
Mounting: install per instruction manual; vertical inclination ≤5°.
Transport & storage: -25°C to +55°C; up to +70°C for short periods (24h).

Applications

The GYW1 air circuit breaker is suitable for power distribution systems in industrial plants, commercial buildings, infrastructure projects, data centers and utility substations, serving as the main incoming or feeder breaker in low-voltage switchgear. Its intelligent controller and communication capability make it well suited for smart distribution and building automation systems.

Note: For detailed assembly and operation instructions, please download the product PDF manual for more information.

Technical Parameters

Main Circuit Technical Parameters

Frame Rated Current Inm (A)		1600	2000	2500	3200	4000	6300
Rated Working Voltage Ue (V)		AC 380/400/415V, AC 660/690V
Rated Working Current In (A)		200/315/400/500/630/800/1000/1250/1600	400/500/630/800/1000/1250/1600/2000	400/630/800/1000/1250/1600/2000/2500	2000/2500/2900/3200	3200/3600/4000	4000/5000/6300
Rated Frequency (Hz)		50/60
Rated Insulation Voltage Ui (V)		1000
Rated Impulse Withstand Voltage Uimp (kV)		12
Breaker Type		Standard / H	Standard / H	Standard / H	Standard / H	Standard / H	Standard
Rated Ultimate Short-Circuit Breaking Capacity Icu (kA)	AC380/400/415V	55 / 65	65 / 80	80 / 85	80 / 100	100 / 100	120
Rated Ultimate Short-Circuit Breaking Capacity Icu (kA)	AC660/690V	25 / 42	50 / 65	65 / 65	65 / 70	80 / 75	80
Rated Service Short-Circuit Breaking Capacity Ics (kA)	AC380/400/415V	42 / 65	65 / 65	65 / 85	85 / 80	100 / 100	100
Rated Service Short-Circuit Breaking Capacity Ics (kA)	AC660/690V	20 / 42	40 / 65	65 / 65	65 / 65	75 / 75	70
Rated Short-Time Withstand Current Icw/1s (kA)	AC380/400/415V	42 / 50	65 / 65	66 / 85	85 / 80	85 / 85	100
Rated Short-Time Withstand Current Icw/1s (kA)	AC660/690V	20 / 42	40 / 65	55 / 65	65 / 65	65 / 65	70
Number of Poles		3 / 4
N-Pole Max Continuous Current		100% In
Installation Type		Drawer Type / Fixed Type
Electrical Life (operations, maintenance-free)	AC415V	7000			6000	5500	2000
Electrical Life (operations, maintenance-free)	AC690V	4500			3000		1000
Mechanical Life (operations)	With maintenance	30000			20000		10000
Mechanical Life (operations)	Maintenance-free	12000			10000		6000
Total Breaking Time (no intentional delay) (ms)		≤30
Closing Time (ms)		≤70
Arcing Distance (mm)		0
Connection Type		Horizontal / Vertical

Power Consumption

Frame Size	Rated Current (A)	Drawer Type Power Loss (W)	Fixed Type Power Loss (W)
1600	1600	≤400	≤150
2000	2000	≤380	≤208
2500	2500	≤520	≤350
3200	3200	≤640	≤450
4000	4000	≤900	≤640
6300	6300	≤1145	≤787

Altitude Derating Factors

Altitude (m)	2000	2500	3000	3500	4000	4500	5000
Rated Impulse Withstand Voltage Uimp (kV)	12
Average Insulation Voltage Ui (V)	1000	900	800	750	700	650	600
Max Working Voltage Ue (V) (50/60Hz)	690	635	580	540	500	460	400
Power Frequency Withstand Voltage (V)	2200	2070	1930	1850	1760	1680	1600

Note: Temperature derating tables (Tables 3–7) for each frame size at 45–60°C are available in the product PDF manual. Please download the PDF for complete derating data and assembly instructions.

Frequently Asked Questions

1. What is the GYW1 Air Circuit Breaker?

The GYW1 is a universal air circuit breaker (ACB) for AC 50Hz distribution networks, rated up to AC 400V/690V with rated currents from 200A to 6300A. It is mainly used for power distribution and protecting circuits and power supply equipment, and can also perform infrequent circuit switching under normal conditions.

2. What are the core functions of the GYW1 ACB?

Overload protection — prevents damage from sustained overcurrent.
Undervoltage protection — optional undervoltage release available.
Short-circuit protection — Icu up to 120kA at AC 380/400/415V.
Grounding fault protection — reduces single-phase grounding hazards.
Selective protection — coordinated tripping avoids unnecessary outages.
Remote communication — open interface supporting “four remote” functions for automation systems.

3. Which parameters matter most when selecting a GYW1 breaker?

Frame size (Inm) — 1600A, 2000A, 2500A, 3200A, 4000A or 6300A.
Rated current (In) — must match load, considering derating above +40°C or above 2000m altitude.
Breaking capacity (Icu/Ics) — must exceed prospective short-circuit current at installation point.
Poles — 3P or 4P (N-pole carries 100% In).
Installation type — fixed or drawer type.
Controller type — M, H, 3M, 3H or S intelligent controller.

4. What specifications and options are available?

Current range — 1600 frame: 200A–1600A; 2000 frame: 200A–2000A; 2500 frame: 630A–2500A; 3200 frame: 2000A–3200A; 4000 frame: 2500A–4000A; 6300 frame: 4000A–6300A.
Operation — manual (M) or motorized (D) operation.
Options — undervoltage release, key locks (one lock one key / three locks two keys), mechanical interlocks (2-unit or 3-unit), auxiliary contacts (standard: 4 changeover contacts).
Standard configuration — M-type intelligent controller, horizontal rear connection.

5. What standards does the GYW1 comply with and which markets is it suitable for?

The GYW1 is designed for low-voltage ACB requirements with rated insulation voltage 1000V, impulse withstand voltage 12kV, pollution degree 3 and selectivity Class B, consistent with IEC 60947-2 type requirements for air circuit breakers. It suits B2B distribution projects worldwide including industrial, commercial and infrastructure markets. Please contact us for specific certification documentation for your target market.

6. What are the installation and maintenance requirements?

Mounting — install per instruction manual; vertical inclination must not exceed 5°.
Environment — ambient temperature -5°C to +40°C (24h average ≤+35°C); altitude ≤2000m without derating; humidity ≤50% at 40°C.
Auxiliary circuit — when main circuit voltage exceeds AC 400V (up to AC 690V), use an isolating transformer of ≥2kVA; control circuit max working voltage AC 400V.
Condensation — take special measures against condensation from temperature changes.
Storage — -25°C to +55°C; up to +70°C for short periods (24h).
Maintenance — mechanical life up to 30,000 operations with maintenance; refer to the PDF manual for detailed assembly and service instructions.

GYW1 Universal Air Circuit Breaker