English
Français
Deutsch
Português
Español
русский 
한국어
العربية
Italiano
Indonesia
Schweiz
Polski
Nederlands
ישראל - עברית
Perzisch
ไทย
日本語
ኢትዮ-አማርኛ
Việt Nam
Kiswahili
Srpski
Ελληνικά
简体中文
CS Switch CM3-250L/4300B 250A Molded Case Circuit Breaker
Brand:
Series:
CM3
Protection Type:
Main body (with protection function)
How It Works:
Manual
Frame Current:
250A
Tripping Mode:
Thermal Magnetic
Protection Function:
LI
Wiring Method:
Front panel wiring
Poles:
4P
Rated Voltage:
400VAC
Installation:
Fixed
Trip Unit:
Compound release
Rated Current of Release:
250A
Breaking Capacity:
50KA
Model:
CM3-250L/4300B 250A
Order Number:
C0068293
Description:
CS Switch Molded Case Circuit Breaker CM3-250L/4300B 250A,LI,50KA,250A,Fixed,Manual,4P
Product parameters
| Product attributes | Attribute value | Filter product attributes |
|---|---|---|
| Brand： | CS Switch | |
| Series： | CM3 | |
| Appendix： | - | |
| Protection Type： | Main body (with protection function) | |
| How It Works： | Manual | |
| Frame Current： | 250A | |
| Tripping Mode： | Thermal Magnetic | |
| Protection Function： | LI | |
| Wiring Method： | Front panel wiring | |
| Poles： | 4P | |
| Rated Voltage： | 400VAC | |
| Installation： | Fixed | |
| Trip Unit： | Compound release | |
| Rated Current of Release： | 250A | |
| Breaking Capacity： | 50KA |
Products with the same attribute : 0
Show details
Series Overview
Product Series Overview
● The CM3 Molded Case Circuit Breaker (hereinafter referred to as the breaker) is an upgraded product of the CM1 series.
● The thermomagnetic CM3 series breakers have six frame sizes: 63A, 100A, 250A, 400A, 630A, 800A, with current ratings from 10A to 800A.
● Based on the level of rated ultimate short-circuit breaking capacity (Icu), the breakers are classified into four levels: C (Basic), L (Standard), M (Higher Breaking Capacity), and H (High Breaking Capacity).
● CM3 breakers with breaking capacity levels C, L, M and CM3E breakers with breaking capacity level M allow reverse connection when used in AC400V distribution systems.
● The entire series of breakers can be installed horizontally, vertically, or flat.
● All breakers in the series feature isolation function, indicated by the symbol: |.
● CM3-100, 250 models (L/M/H types), CM3-400, 630 models (C/L/M/H types), CM3-800 models (L/M/H types), and the above specifications in four-pole configuration with neutral pole types A or B, can feature a unique "Overload Alarm Without Tripping" function. This ensures power supply continuity and meets the requirements of GB50054 Clause 6.3.6.
● The breakers comply with the following standards:
● IEC 60947-1 & GB/T 14048.1-2012 Low-voltage switchgear and controlgear - General rules
● IEC 60947-2 & GB/T 14048.2-2008 Low-voltage switchgear and controlgear - Circuit-breakers
● IEC 60947-4-1 & GB/T 14048.4-2010 Low-voltage switchgear and controlgear - Contactors and motor-starters - Electromechanical contactors and motor-starters (including motor protection devices)
Application Scenarios
Low-Voltage Distribution Protection
● CM3 distribution breakers can be used in AC 50/60Hz TN, TT, IT distribution systems, meeting the requirements of GB50054 regarding "Selection of Electrical Apparatus".
● The reliable contact position indication and isolation function of the entire series meet the requirements of GB50054 for isolation devices.
Motor Circuit Protection
● CM3 motor protection breakers provide overcurrent protection for motor starters, cables, and motors. Their protection characteristics meet GB/T 14048.4, and their application meets GB50055.
● CM3-250C, 100C, and CM3-63 breakers have a thickness of only 60mm, allowing installation in equipment control cabinets for device protection.
Transfer Function
● Two CM3 breakers equipped with a mechanical interlock can achieve manual transfer between two power sources for the same device or between two devices on the same power source.
● Two breakers equipped with mechanical-electrical interlocks and controllers, etc., can achieve automatic transfer of power sources (refer to the CA1/CA1B/CA1W series Automatic Transfer Switching Equipment sample data).
Photovoltaic (PV) Grid Connection
● CM3 breakers equipped with a PV grid-connection dedicated undervoltage release meet the State Grid Corporation of China (SGCC) Q/GW 1972 and Q/GDW 1973 standards, enabling voltage presence detection for automatic closing.
● CM3 and CM3L breakers featuring loss-of-voltage/overvoltage trip protection and voltage presence detection for closing comply with the requirements of the SGCC "Typical Design for Grid Connection Projects of Distributed Photovoltaic Poverty Alleviation Projects".
Thermomagnetic Breaker Communication
● CM3 breakers configured with the FZT3 status upload module can provide ON, OFF, TRIPPED status signals to an upper-level computer and allow remote control of the breaker (ON/OFF), enabling communication functions for thermomagnetic breakers.
High-Precision Measurement
● CM3 breakers with the PMD3 power measurement module assembled at the outgoing terminals enable power measurement in AC400V distribution systems without requiring additional wiring (no extra power supply needed, no external current transformers required, no voltage sampling connections needed, no communication lines needed). They feature compact size and small dimensions. Their measurement performance meets the IEC 61557-12 (GB/T 18216.12) standard. The energy measurement accuracy class is 1, meeting the requirements for Class 2 accuracy electrical measurement applications on main distribution boards per IEC 60364-8-1.
Normal Service and Mounting Conditions
● Ambient air temperature: -5°C to +40°C;
● Altitude at installation site: not exceeding 2000m;
● Relative humidity at installation site: not exceeding 50% at a maximum temperature of +40°C; higher relative humidity is permissible at lower temperatures, e.g., 90% at 20°C. Special measures should be taken for occasional condensation due to temperature changes;
● Pollution degree: 3;
● Breakers meet GB/T 2423.10 test requirements, capable of withstanding mechanical vibration: 2Hz to 13.2Hz at displacement ±1mm and 13.2Hz to 100Hz at acceleration ±0.7g;
● Installation category for the main circuit: III; for other auxiliary and control circuits: II;
● Breakers are suitable for electromagnetic environment A;
● Tropical humid type (TH type) breakers meet GB/T 2423.4 and GB/T 2423.18 test requirements, capable of withstanding the effects of damp heat, salt mist, oil mist, and mold;
● Breakers should be installed in locations free from explosion hazards, conductive dust, and substances corrosive to metal or destructive to insulation;
● Breakers should be installed in locations protected from rain and snow.
Service Conditions:
● Breakers meet GB/T 2423.1 and GB/T 2423.2 test requirements. Ambient air temperature can be as low as -25°C (products available down to -40°C, please consult our company) and as high as +70°C (derating required above +40°C, see technical data in this catalog);
● Breakers meet GB/T 2423.4 Test Db requirements (temperature +55°C, relative humidity 95%);
● Characteristics unaffected up to 2500m altitude (derating required above 2500m, see technical data in this catalog);
● Storage conditions: Ambient air temperature -25°C to +70°C.
High Voltage AC Breakers
Overview
● Domestically pioneered high-breaking-capacity plastic-case breakers for voltages up to AC800V, 1000V.
● High-voltage CM3 breakers have three frame sizes: 250, 400, 630, with current ratings from 63A to 630A;
● Can be used in AC800V, 1000V systems on the generation side of photovoltaic power stations.
AC550V Photovoltaic Dedicated AC Breakers
Overview
● CM3 PV dedicated breakers launched specifically for AC550V voltage systems on the generation side of photovoltaic power stations; can also be used in AC400V, 500V, or 690V systems as needed. There are four frame sizes, with current ratings from 10A to 400A.
● CM3 PV dedicated breakers launched specifically for AC550V voltage systems on the generation side of photovoltaic power stations; can also be used in AC400V, 500V, or 690V systems as needed. There are four frame sizes, with current ratings from 10A to 400A.
Rachel
Industrial Control Sales Specialist: Focuses on delivering high-performance, cost-effective industrial control products. Offers end-to-end one-stop procurement support—covering rapid quotation, streamlined order fulfillment, and responsive after-sales service—to simplify clients’ procurement processes.
Email: Anthony@icxsg.com
We offer competitive product pricing. For fast support, send your email, phone, address, and the product model & quantity you want—we’ll reach out quickly!
We typically respond via email within one business day! You can also contact us at Anthony@icxsg.com
