Overview
The ABB S282UCK3A is a compact miniature circuit breaker (MCB) part of ABB’s System pro M line. This 2-pole, 3-amp breaker combines thermal and magnetic trip mechanisms to deliver dependable protection against overloads and short circuits in industrial, commercial, and building automation applications. The K-characteristic curve (magnetic trip at 8–12× rated current) suits inductive loads and motors, making it ideal for systems with moderate inrush currents.
Key Features
- Dual thermal-magnetic tripping for consistent performance across AC and DC circuits
- K-characteristic curve optimized for inductive and motor-driven loads
- Compact DIN rail-mount design with top and bottom combi-box terminals
- Suitable for solid or flexible conductors 0.75–35 mm² (dependent on busbar configuration)
- Rated for operation up to 220 V DC or 440 V AC (2-pole configuration)
- EN 60898 / IEC 898 compliant switching sequences and short-circuit rupturing capacity
Technical Specifications
This breaker meets international safety and performance standards. Detailed specs are below:
Electrical Ratings
- Rated Current: 3 A
- Number of Poles: 2
- Max. Operating Voltage (AC): 440 V (Un + 10 % per UL 1077 / CSA 22.2)
- Max. Operating Voltage (DC): 110 V (2-pole)
- Trip Characteristic: K (8–12× In magnetic trip)
- Conductor Compatibility: 0.75–35 mm² solid or flexible wire
Mechanical & Environmental
- Mounting: DIN Rail, top/bottom terminals (safe against unintentional touch per DIN VDE 0106 Part 100)
- Terminal Type: Combi-box terminals (top and bottom)
- Insulation: Per DIN VDE 0110 Parts 1 & 2
- Degree of Protection: IP20 (typical for System pro M series)
- Standards: EN 60898, IEC 898, VDE 0660, UL 1077, CSA 22.2
Typical Applications
The S282UCK3A suits a wide range of industrial and building control circuits:
- Motor starters and soft-start circuits with moderate inrush currents
- Lighting and HVAC distribution panels
- Control and signaling circuits in industrial automation systems
- Branch protection in multi-circuit control cabinets
- OEM panel builders requiring compact, reliable overcurrent protection
Compatibility & Replacements
The ABB S282UCK3A is part of the S 280 family of System pro M miniature circuit breakers. Related part numbers in the 3 A range include S282–K3A and other K-characteristic variants. When sourcing replacements, verify the exact voltage rating (220 V vs. 440 V AC), trip curve, and terminal configuration match your control design. ABB offers auxiliary accessories (shunt trips, signal contacts, and auxiliary contacts) that can be added to the left of the main breaker module for remote operation and status indication.
