HYM1 Molded Case Circuit Breaker – 63A/125A/250A/400A/630A/800A/1250A
The HYM1 is a molded case circuit breaker rated 10A–1250A for AC 690V and DC 250V systems. Seven frame sizes. Three breaking levels: L, M, H. Icu up to 100kA at 400V. Poles: 2P, 3P, 4P. Compact with minimal flying arc distance (0–100mm). Thermal-magnetic trip. Fixed and plug-in installation. Suitable for onshore and offshore environments.
Standards: IEC 60947-2
Rated Voltage: AC 690V / DC 250V
Rated Current: 10A – 1250A
Frame Sizes: 63, 125, 250, 400, 630, 800, 1250
Breaking Levels: L, M, H
Poles: 2P, 3P, 4P
Applications: Onshore, Offshore, Industrial
Product Information
HYM1 Molded Case Circuit Breaker – 690V and DC 250V Applications
The HYM1 Molded Case Circuit Breaker from HUYU Electric is designed for scenarios where a standard AC 400V molded case circuit breaker cannot support higher voltage or mixed AC/DC installations. With ratings for AC 690V and DC 250V across seven frame sizes (10A to 1250A), it is suitable for a variety of applications including onshore and offshore power distribution, mining switchboards, marine auxiliary circuits, and industrial plants where 690V is the standard supply voltage.
It offers three breaking levels — L, M, and H — ensuring the right fault capacity for specific parts of an installation, from branch circuits to main incomers. With a compact design, the flying arc distance is minimized: ≤0mm on the 63A frame, ≤50mm on 125–400A frames, and ≤100mm on 630–1250A frames, allowing efficient panel configurations. Customers switching from Schneider, ABB, Siemens, Eaton, or L&T for 690V applications can benefit from HUYU Electric’s factory-direct OEM/ODM pricing, private labeling options, and full IEC 60947-2 compliance documentation.
Frame Sizes & Breaking Levels – 10A to 1250A, L / M / H
| Frame | Rated Current | Breaking Levels | Icu at 400V (kA) | Poles | Flying Arc Distance | Typical Application |
|---|---|---|---|---|---|---|
| HYM1-63 | 10A – 63A | L, M | 25 – 50 | 3P, 4P | ≤0mm | Branch circuits, compact panels |
| HYM1-125 | 16A – 125A | L, M, H | 35 – 85 | 2P, 3P, 4P | ≤50mm | Feeders, motor protection, AC/DC circuits |
| HYM1-250 | 100A – 250A | L, M, H | 35 – 85 | 3P, 4P | ≤50mm | Sub-main distribution, commercial boards |
| HYM1-400 | 225A – 400A | L, M, H | 50 – 100 | 3P, 4P | ≤50mm | Main distribution, industrial incomers |
| HYM1-630 | 400A – 630A | L, M, H | 50 – 100 | 3P, 4P | ≤100mm | Main incomers, heavy industry |
| HYM1-800 | 630A – 800A | L, M, H | 75 – 100 | 3P, 4P | ≤100mm | Large incomers, generator feeders |
| HYM1-1250 | 800A – 1250A | M, H | 30 – 80 | 3P, 4P | ≤100mm | Large main incomers, 690V systems |
Technical Specifications
| Product Model | HYM1 Series |
| Standard | IEC 60947-2 |
| Frame Sizes | 63, 125, 250, 400, 630, 800, 1250 |
| Rated Current In (A) | 10 – 1250 |
| Rated Voltage | AC 690V / DC 250V |
| Breaking Levels | L, M, H |
| Icu at 400V (kA) | 25 – 100 |
| Poles | 2P (125 frame), 3P, 4P |
| Flying Arc Distance | 0mm (63 frame); ≤50mm (125–400); ≤100mm (630–1250) |
| Trip Unit | Thermal-magnetic |
| Installation | Fixed / Plug-in |
| MOQ | Contact for project quotation |
Source 690V Molded Case Circuit Breaker – Direct from Factory
Providing solutions from 10A to 1250A, IEC 60947-2 compliant, and supporting OEM branding and project customization. Request your quotation now for tailored configurations and lead times.
Project Pricing • IEC 60947-2 • Global Shipping
OEM/ODM Supply – Molded Case Circuit Breaker for Specialized Industries
HYM1 for AC 690V and DC 250V Mixed Installations
Unlike conventional MCCBs limited to 400V, the HYM1 series steps up to accommodate 690V AC three-phase systems and 250V DC, making it ideal for industrial settings, marine operations, battery banks, and UPS systems. Competitive OEM programs with private labeling and IEC-certification ensure flexibility and cost efficiency for our customers.
How to Choose a Molded Case Circuit Breaker: Voltage & Frame Selection
Key considerations for selecting HYM1 MCCBs for industrial AC and DC applications.
1. Understanding the Importance of 690V
Many industrial operations still operate at 690V AC three-phase instead of the standard 400V, making essential the selection of breakers rated for higher voltage. DC 250V support also enables applicability across battery banks and UPS systems.
2. Selecting Breaking Levels
Choosing the appropriate L, M, or H breaking level is critical. L is suitable for systems with low fault currents. M-level breakers fit general distribution, while H levels meet the requirements for environments with high fault levels.
3. Choosing an Optimal Frame Size
Start with smaller frames for branch circuits and scale up to larger ones for mains. Avoid oversizing by picking a frame matched to the specific load demands.
4. Panel Design Features
The flying arc distance varies by frame and impacts switchboard design options, with the 63A frame offering 0mm for tight packing possibilities.
Frequently Asked Questions
What is A molded case circuit breaker?
A molded case circuit breaker (MCCB) is an overcurrent protection device encased in a moulded insulating housing. It protects electrical circuits against overload and short circuit, and can also be equipped with accessories for undervoltage tripping, shunt tripping, and motor operation. MCCBs cover a current range from approximately 10A to 1600A, filling the gap between miniature circuit breakers (MCBs) and air circuit breakers (ACBs). The HYM1 is a molded case circuit breaker rated up to 1250A at 690V AC.
What is the difference between MCCB and MCB?
An MCB (Miniature Circuit Breaker) is a compact, DIN-rail-mounted device typically rated up to 63A, used for final circuit protection such as lighting and socket outlets. An MCCB is larger, rated from 10A to 1600A, and designed to handle higher fault currents. Key differences: MCCBs have higher breaking capacities (up to 100kA vs 6–10kA for MCBs), are available in fixed and plug-in configurations, and can be equipped with a wider range of accessories including motor operators and communication modules. The HYM1 is an MCCB; use it for branch circuits, feeders, and sub-main protection where an MCB would be undersized.
What is the difference between A molded case circuit breaker and A non molded case circuit breaker?
A molded case circuit breaker has its contacts, arc chutes, and trip mechanism enclosed within a moulded plastic or resin case that provides structural integrity and arc containment. A non-molded case breaker — such as an air circuit breaker (ACB) — has an open-frame construction where the components are mounted on a chassis without a sealed case. Molded case breakers are more compact and economical; non-molded breakers handle higher currents and often include withdrawable rack-out functionality. The HYM1 is a molded case circuit breaker; HUYU’s EXW3 and HUW9 series are non-molded (open-frame) ACBs for main incomer applications.
What is A MCCB breaker used for?
An MCCB is used for overcurrent protection in branch circuits, feeders, and sub-main distribution where the current rating or fault level exceeds the capability of an MCB. Common applications include motor control centers, commercial and industrial distribution boards, generator feeders, UPS protection, and main incomers up to 1600A. The HYM1 extends these applications to 690V AC and 250V DC systems, making it suitable for marine, offshore, mining, and other high-voltage or mixed AC/DC environments.
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