VIOX VMM3-250 3P 250A AC400V/690V MCCB
VIOX VMM3-250 MCCB delivers robust protection for power distribution networks up to 250A. This IEC60947-2 compliant device features a 35kA breaking capacity at 400V AC and supports current ratings from 100A to 250A. Available in 2P, 3P, and 4P configurations, it operates at 400V/690V AC with 800V insulation voltage. Key advantages include compact size, high breaking capacity, and excellent anti-vibration properties. Suitable for various applications, it offers overload and short-circuit protection with inverse time and instantaneous tripping characteristics. Operating effectively from -5°C to +40°C and up to 2000m altitude, this MCCB ensures reliable performance in demanding electrical environments. Its versatile design, including multiple N-pole options and release configurations, makes it ideal for power distribution protection needs, offering superior safety features and compliance with international standards.
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VIOX VMM3-250 3P 250A AC400V/690V Moulded Case Circuit Breaker (MCCB)
Product Overview
The VIOX VMM3-250 Moulded Case Circuit Breaker (MCCB) is a high-performance device designed for power distribution networks with AC 50Hz, rated operating voltage up to 690V, and rated operating current up to 250A. It offers superior protection against overload, short circuit, and other faults while featuring compact size, high breaking capacity, short arcing time, and excellent anti-vibration properties.
Key Features
- Rated Current: Up to 400A
- Poles: Available in 2P, 3P, 4P configurations
- Rated Working Voltage: 400V/690V AC
- Rated Insulation Voltage: 800V
- Breaking Capacity: Standard (S) and Higher (H) types available
- Compliance: IEC60947-2 and GB/T14048.2 standards
Product Category
- According to the breaking capacity of the circuit breaker, it is divided into: a standard type (S type); b higher type (H type);
- According to the wiring method of the circuit breaker: a. Wiring in front of the board; b. Wiring behind the board; c. Plug-in type; d. Pull-out type;
- According to the operation mode: a. Direct operation by handle; b. Operation by turning handle; c. Electric operation;
- According to the number of poles: two poles; three poles; four poles;
- According to accessories: alarm contacts, auxiliary contacts, shunt release, undervoltage release;
Technical Specifications
Circuit breaker rating
| Model | Frame rating rated current In(mA) |
Rated current In(A) |
Rated working voltage (V) |
Rated Insulation voltage (V) |
Rated ultimate short circuit breaking capacity Icu(kA) |
Rated operating short-circuit breaking capacity Ics(kA) |
Number of poles |
Flashover distance (mm) |
| VMM3-125S | 125 | 16,20,25,32, 40,50,60,80, 100,125 |
400/415 | 1000 | 25 | 18 | 3P | ≤50 |
| VMM3-125H | 125 | 35 | 25 | 3P | ||||
| VMM3-250S | 250 | 100,125,160, 180,200,225, 250 |
400/690 | 800 | 35/10 | 25/5 | 2P,3P,4P | ≤50 |
| VMM3-250S | 250 | 600 | 50 | 35 |
Inverse time breaking action characteristics of overcurrent release of distribution circuit breaker when all poles are energized at the same time
| Test current name | I/In | Appointed time | Starting state |
| Agreed no tripping current | 1.05 | 2h(In＞63A),1h(In≤63A) | Cold state |
| Agreed tripping current | 1.3 | 2h(In＞63A),1h(In≤63A) | Immediately after the sequence 1 test, start |
Inverse time breaking action characteristics of overcurrent release of circuit breaker for motor protection when all poles are energized at the same time
| Setting current | Appointed time | Starting state | Remark |
| 1.0In | >2h | Cold state | |
| 1.2In | ≤2h | Immediately after the sequence 1 test, start | |
| 1.5In | ≤4min | cold state | 10 ≤ In ≤ 250 |
| ≤8min | cold state | 250 ≤ In ≤ 630 | |
| 7.2In | 4s≤T≤10s | cold state | 10 ≤ In ≤ 250 |
| 6s≤T≤20s | cold state | 250 ≤ In ≤ 800 |
The instantaneous operating characteristics of the circuit breaker for distribution are set to 10In±20%, and the instantaneous operating characteristics of the circuit breaker for motor protection are set to 12In±20%.
Operating Conditions
- Altitude: Not exceeding 2000m
- Ambient Temperature: -5°C to +40°C (24-hour average not exceeding +35°C)
- Relative Humidity: Not exceeding 50% at +40°C, higher humidity allowed at lower temperatures
- Pollution Level: 3
Product Model Coding System
The VMM3 series uses a comprehensive coding system to specify exact configurations:
- V: Company code (Viox)
- M: Moulded case circuit breaker
- M3: Design code
- -: Separator
- □: Breaking capacity characteristic code (S for standard type, H for higher type)
- □: Frame rating/rated current
- /: Separator
- □: Number of poles (2P, 3P, 4P)
- □: Trip mode (2 for single magnetic, 3 for thermal magnetic)
- □: Release code (see Table 1 for details)
- □: Purpose code (2 for protecting power distribution)
- □: N-pole type (see note for details)
N-pole Types
Four types of neutral pole (N pole) configurations are available for four-pole products:
- A-type N pole: Not equipped with overcurrent tripping components, always connected
- B-type N pole: Equipped with overcurrent tripping component, N pole is closed first and opened together with other poles
- C-type N pole: Equipped with an overcurrent tripping component, N pole is closed and opened together with other poles
- D-type N pole: Equipped with an overcurrent tripping component, always connected
Release Options (Table 1)
| Attachment code | Electromagnetic release | Duplex release |
|---|---|---|
| No accessories | 200 | 300 |
| Alarm contact | 208 | 308 |
| Shunt tripper | 210 | 310 |
| Auxiliary contacts | 220 | 320 |
Shape Size and Installation Dimensions
| CJMM3-125, 250 appearance and installation dimensions (Front panel wiring) | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Model | Dimensions | Installation dimensions | ||||||||||||||||||
| L | W | H | L1 | L2 | W1 | W2 | W3 | H1 | H2 | H3 | H4 | C | E | F | G | G1 | A | B | Φd | |
| VMM3-125S | 150 | 92 | 76 | 251 | 132 | 30 | – | – | 95.5 | 26 | 18 | 3 | 95 | 49 | 28 | 17.5 | 8 | 30 | 129 | 4 |
| VMM3-125H | 150 | 92 | 76 | 251 | 132 | 30 | – | – | 95.5 | 26 | 18 | 3 | 95 | 49 | 28 | 17.5 | 8 | 30 | 129 | 4 |
| VMM3-250S | 165 | 106 | 87 | 300 | 144 | 35 | – | 75 | 110 | 24 | 20 | 3 | 102 | 57 | 24.5 | 23.5 | 11.5 | 35 | 126 | 5.5 |
| VMM3-250H | 165 | 106 | 105 | 300 | 144 | 35 | 142 | 75 | 127 | 24 | 20 | 3 | 102 | 57 | 24.5 | 23.5 | 11.5 | 35 | 126 | 5.5 |
The Viox VMM3-400 3P 400A MCCB offers reliable circuit protection with its robust design and advanced features. It’s an excellent choice for demanding electrical environments where performance and safety are paramount.
