ABB A30-30-10 AC Contactor – A-Series

ABB A30-30-10: Three-Pole 30 A AC Contactor for Motor Control and Power Switching Circuits

The ABB A30-30-10 is a three-pole, 30 A rated AC contactor belonging to ABB’s A-Series standard contactor family. Engineered to IEC 60947-4-1 and EN 60947-4-1, this device is purpose-built for AC-3 and AC-4 utilization categories — covering squirrel-cage motor starting, plugging, and inching duty cycles. Its silver-alloy contact system, double-break arc chamber geometry, and thermally stable coil assembly make it a structurally sound choice for continuous-duty motor control panels operating in ambient temperatures from −25 °C to +60 °C.

At its core, the A30-30-10 functions as the primary switching element in a motor control circuit. When the coil receives its rated control voltage, the electromagnetic flux generated by the laminated silicon-steel core pulls the armature against the fixed core, mechanically closing the three main power contacts and the integrated 1NO auxiliary contact simultaneously. Contact closure time is typically under 20 ms, and release time upon de-energization is under 15 ms — parameters that are critical for coordinated protection schemes involving upstream circuit breakers and downstream overload relays. The 1NO auxiliary contact (rated 10 A, 250 V AC) provides a feedback signal path for PLC digital input modules or hardwired interlock logic without requiring an external add-on block for basic applications.

The contactor’s DIN rail and screw-panel mounting compatibility, combined with its standardized 45 mm width footprint, allows direct integration into existing ABB MNS, Siemens SIVACON, or custom fabricated steel enclosures without panel modification. Coil voltage options span 24 V, 110 V, 220 V, and 380 V AC at 50/60 Hz, specified by suffix code at time of order.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The A30-30-10 employs a double-break contact architecture on each main pole. Each pole contains two contact gaps in series, which distributes the arc energy across two interruption points rather than one. This halves the voltage stress per gap during arc extinction, reducing contact erosion rate and extending electrical service life under AC-3 duty. The silver-cadmium oxide (AgCdO) or silver-tin oxide (AgSnO₂) contact material — depending on production batch — provides stable contact resistance across the full thermal operating range, with bulk resistivity remaining below 2 μΩ·cm at rated current.

The laminated silicon-steel magnetic core is designed with a shading ring on the fixed pole face. This shading ring creates a phase-shifted flux component that prevents the 50/60 Hz AC flux from passing through zero simultaneously across the entire pole face, eliminating the mechanical chatter (hum) that would otherwise occur at twice the supply frequency. The result is a sealed-state holding force that remains continuous rather than pulsating, which is essential for vibration-sensitive installations such as precision machining centers or analytical instrument panels.

EMC performance is addressed through the coil circuit design. The coil winding is encapsulated in a thermosetting resin compound that provides both mechanical damping and dielectric isolation between the coil and the magnetic frame. This construction achieves a coil-to-frame insulation resistance exceeding 100 MΩ at 500 V DC, and the assembly passes IEC 60947-1 impulse withstand voltage tests at 6 kV (1.2/50 μs waveform). For installations with high conducted interference — such as variable frequency drive (VFD) panels — the coil terminals accept RC snubber modules or varistor suppressors from ABB’s accessory range, clamping inductive kickback transients to below 1.5× rated coil voltage.

The auxiliary contact block (1NO) is mechanically actuated by the same armature linkage as the main contacts, ensuring zero differential travel between power and signal switching. This synchronous actuation is critical for PLC feedback loops where a delayed auxiliary signal could cause false fault detection or race conditions in ladder logic rungs monitoring contactor state.

System Integration Benefits

• Direct DIN Rail Compatibility: The 45 mm body width and standard EN 60715 DIN rail clip allow installation alongside ABB S-Series MCBs and MS-Series motor starters without spacing adapters, reducing panel width by up to 15% compared to non-standardized contactor frames.
• Snap-On Auxiliary Block Expansion: ABB CA5-10, CA5-01, and CA5-22 auxiliary contact blocks attach to the front face without tools, adding up to 4 additional signal contacts (2NO+2NC) for multi-zone interlock schemes or SCADA feedback wiring.
• Overload Relay Direct Coupling: ABB TA25DU and TA42DU thermal overload relays mount directly to the contactor base via a mechanical coupling bridge, eliminating inter-device wiring and reducing the motor starter assembly footprint to a single compact unit.
• PLC Output Compatibility: The 24 V AC coil variant draws under 70 VA inrush and 7 VA sealed, well within the sourcing capacity of standard PLC transistor or relay output modules rated at 0.5 A per channel, enabling direct coil drive without intermediate interface relays in most applications.
• Deterministic Switching Latency: Operate time under 20 ms and release time under 15 ms provide predictable switching windows for time-critical sequences such as star-delta transition timers, where contact changeover must occur within a defined window to prevent phase-to-phase short circuits.
• Reversing Starter Configuration: Two A30-30-10 units combined with ABB CAL4-11 mechanical interlock form a fully interlocked reversing starter. The mechanical interlock physically prevents both contactors from closing simultaneously, providing a hardware-level safeguard independent of PLC logic.
• Diagnostic Transparency: The 1NO auxiliary contact provides a hardwired contactor-closed confirmation signal that can be wired to a PLC digital input for real-time motor run status monitoring, enabling predictive maintenance routines based on actual switching cycle counts logged by the control system.
• Thermal Coordination with Upstream Protection: The A30-30-10’s short-circuit withstand rating (SCCR) is coordinated with ABB S200 series MCBs in Type 2 coordination per IEC 60947-4-1 Annex B, meaning the contactor survives a prospective fault current event without welded contacts or structural damage, allowing restart after fault clearance without component replacement.

Quality Assurance & Global Logistics

Every ABB A30-30-10 unit supplied through siemensplc.com is sourced from ABB-authorized distribution channels with full batch traceability. Each unit undergoes a four-stage incoming inspection protocol: visual examination of housing integrity and label authenticity against ABB’s current holographic security markings; functional coil energization test at rated voltage to verify operate and release times; main contact resistance measurement using a micro-ohmmeter (target: <1 mΩ per pole at rated current); and packaging integrity verification to confirm factory-sealed condition.

Counterfeit risk is mitigated through direct cross-referencing of batch codes against ABB’s authorized distributor database. Certificate of conformity, material test reports, and packing lists are available upon request for quality-critical procurement processes in industries such as oil and gas, pharmaceutical manufacturing, and power generation.

Logistics operations are based in Xiamen, China — a major southeastern port city with direct sea freight connections to Rotterdam, Los Angeles, Dubai, and Singapore, and air freight access via Xiamen Gaoqi International Airport to global destinations within 3–7 business days. In-stock orders are processed and dispatched within 1–3 business days. Express DHL, FedEx, and UPS services are available for urgent requirements. All shipments include commercial invoice, packing list, and certificate of origin for customs clearance. Import duty classification falls under HS Code 8536.49 (contactors for voltage ≤ 1,000 V).

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.