ABB Molded Case Circuit Breaker AC250-4P-150A

Complete Model Interpretation (Formula A2 Series)

1. Paramètres électriques de base

III. Structural and Functional Characteristics

1. Mechanical and Physical Characteristics

Dimensions: 90mm (W) × 160mm (H) × 105mm (D) (standard 4-pole size), complies with modular design, easy for side-by-side installation

Méthode de fonctionnement: Rotary handle (red for OFF/green for ON), with clear position indication, moderate operating torque

Durée de vie mécanique: 20,000 fois (open-close cycles), Durée de vie électrique: 5,000 fois (at rated current)

Méthode de montage: Fixed type (standard), plug-in/withdrawable type optional, suitable for different maintenance requirements

2. Fonctions de protection (TMF Thermal-Magnetic Trip)

3. Accessory Expansion Capability

Optional Under-Voltage Release (UVR): Trips when voltage is below 70% of rated value, prevents equipment damage caused by low-voltage operation

Optional Shunt Trip: Remote control tripping, realizes functions such as fire linkage

Optional Auxiliary Contacts: 2NON+2NC, used for status indication or control circuit

Optional Alarm Contacts: 1NON, used for fault alarm signal output

1. Scénarios d'application et recommandations de sélection
2. Scénarios d'application typiques

2. Key Selection Matching Points
3. Load Type Matching

Motor load: Select 1.2-1.3×motor rated current (150A suitable for ≤75kW motors)

Lighting/socket load: Select 1.0-1.1×calculated current

Mixed load: Select according to the largest load type, taking into account other loads

2. Breaking Capacity Selection

General distribution system: 25le (Tapez C) is sufficient

Locations close to transformers or with large short-circuit current: Select models with 36kA (Type N) or 50kA (Type H) breaking capacity

3. System Earthing Configuration

TN-C-S/TN-S system: 4-pole circuit breaker must be selected to provide neutral line protection

TT system: 3P or 4P can be selected as required

1. Installation and Maintenance Points
2. Spécifications d'installation

Exigences environnementales: Temperature -5℃~+40℃ (derating required when exceeding 40℃, 2% derating per 1℃ increase), humidity ≤95% (pas de condensation)

Installation Position: Vertical installation (handle upward), reserve ≥50mm space above and below to ensure good heat dissipation

Exigences de câblage: Copper bar cross-sectional area ≥70mm² (for 150A current), bolt torque complies with ABB specifications (20Nm for M8 bolts)

2. Recommandations d'entretien

Regular inspection (every 6 mois): Check handle operation flexibility, terminal tightness, and trip unit function test

Gestion des défauts: Troubleshoot the cause (overload/short circuit) after tripping, reset only after fault elimination, forced closing is strictly prohibited

Life management: Replace in time when mechanical/electrical life is reached to ensure protection reliability

1. Replacement and Upgrade Solutions
2. Same-Series Replacement

2. Upgrade Solutions

Intelligent Upgrade: Replace with Formula A2 series model with PR221-LI electronic trip unit, supports communication function (Modbus) to realize remote monitoring and fault diagnosis

Breaking Capacity Upgrade: Upgrade to XT series (par ex., XT3S 250 TMD 150 4P.), breaking capacity up to 50kA, suitable for heavy industry environments

VII. Résumé

ABB Molded Case Circuit Breaker AC250-4P-150A (complete model A2C 250 TMF 150-1500 4p F F) is a cost-effective and reliable general-purpose protection electrical device, suitable for most 400V low-voltage distribution systems. Its core advantages are:

1. 4-Pole Full Protection: Suitable for modern building TN-S distribution system, neutral line can also get effective protection
2. 25kA Breaking Capacity: Meets the short-circuit protection requirements of general industrial and commercial buildings
3. TMF Thermal-Magnetic Trip: No external protection device required, easy installation and maintenance
4. Conception modulaire: Supports expansion of various accessories to adapt to different application scenarios

Selection should be comprehensively considered according to load type, short-circuit current size and system earthing configuration to ensure the circuit breaker matches the system and provides the best protection effect.

Detailed Comparison Table of ABB AC250-4P-150A and Same-Specification Molded Case Circuit Breakers of Mainstream Brands

1. Core Parameter Comparison Table (250A Frame, 4P., 150UN, Thermal-Magnetic Trip, 25kA Breaking Capacity)

1. Protection Function Comparison

III. Performance Characteristics and Application Scenario Comparison

1. Key Selection Points
2. Breaking Capacity Matching

General distribution system: 25kA breaking capacity is sufficient (ABB A2C, Schneider EZD, Siemens 3VC2, Chint NXM)

Locations with large short-circuit current: Select 36kA breaking capacity (Schneider CVS) or 50kA breaking capacity (ABB A2N, Schneider NSX)

2. System Earthing Configuration Adaptation

TN-C-S/TN-S system: 4-pole circuit breaker must be selected, all brands provide full-pole protection

TT system: 4P or 3P+N can be selected to ensure reliable neutral line disconnection

3. Load Type Selection

4. Accessory Expansion Requirements

Télécommande: Select shunt trip + contacts auxiliaires

Voltage Monitoring: Select under-voltage release

Surveillance de l'état: Select alarm contacts + communication module (electronic trip unit model)

1. Résumé

Selection should be comprehensively considered based on four core factors: load type, short-circuit current size, system earthing configuration and budget to ensure the circuit breaker perfectly matches the system and provides the best protection effect. For most conventional applications, ABB AC250-4P-150A is an excellent choice balancing performance and price; Chint NXM is an ideal domestic replacement solution when budget is limited; Schneider CVS series is recommended for upgrade when short-circuit current is large.