ABB A185-30-11-80 AC Contactor

หมายเลขคำสั่งซื้อ: 1SFL491001R8011｜Status: Legacy A series discontinued, direct replacement AX185-30-11-80 (1SFL491074R8011)

การใช้งานทั่วไป: 3-phase motor starting, bypass circuits, การกระจายอำนาจ, HVAC water pumps, แฟน ๆ, เครื่องอัดอากาศ, การสลับตัวเก็บประจุ (เอซี-1). Compliant with IEC/GB14048.4

✅ Model Breakdown

A185: ขนาดเฟรม, rated 185A at AC-3, 415วี

30: 3 normally open main contacts, ไม่มีผู้ติดต่อหลักที่ปิดตามปกติ

11: Built-in auxiliary contacts 1NO+1NC

80: Coil code → AC220-230V 50Hz / AC230-240V 60Hz

📌 Core Electrical Specifications

เสา: 3ป

แรงดันไฟฟ้าวงจรหลักสูงสุด: 690วี

กระแสความร้อนแบบธรรมดา Ith (40℃ free air): 275ก

เอซี-3 (motor duty, 55℃): 400/415V → 185A

เอซี-1 (โหลดตัวต้านทาน, 55℃): 690V → 250A

พลังการยึดคอยล์: 35VA @50Hz; พลังพุ่งเข้ามา: 550VA @50Hz

ช่วงแรงดันไฟฟ้าปฏิบัติการ: 0.85~1.1×Uc

ชีวิตเครื่องกล: 5 ล้านการดำเนินงาน; Electrical life AC-3: ประมาณ. 1 ล้านการดำเนินงาน

ความถี่การทำงานสูงสุด: 300 cycles/hour for AC-3; 3600 cycles/hour mechanical

🔌 Wiring Specifications (Main Circuit Copper Cable)

Single solid conductor: up to 120mm²

การเดินสายหน้าสัมผัสเสริม: 0.75~2.5 มม.² (with crimp terminals)

🧩 Compatible Accessories (Interchangeable with AX185)

รีเลย์โอเวอร์โหลดความร้อน: TA200DU (for 185A range)

บล็อกหน้าสัมผัสเสริม: CAL18 (side mount), CA5 (front mount)

เครื่องป้องกันไฟกระชาก: RC snubber, varistor

ลูกโซ่ทางกล, busbar connectors, ขั้วต่อเทอร์มินัล

🔁 Replacement Information (หมายเหตุสำคัญ)

Discontinued legacy model: A185-30-11-80

Fully compatible replacement: AX185-30-11-80, ขนาดการติดตั้งที่เหมือนกัน, cutout and wiring, upgraded performance and readily available stock

Coil code cross reference: 81=24V, 83=48V, 84=110V, 85=380V, 80=220/230V

📎 HS Code

รหัส HS: 85364900 (electromagnetic contactor, >32ก)

⚠️ คัดเลือก & เคล็ดลับการบำรุงรักษา

For heavy-duty motors, reversing or frequent start-stop applications, select next higher frame size or AF series (AC/DC wide-voltage coil);
Derating is required for ambient temperature＞55℃ or installation inside enclosed cabinets;
Verify coil voltage code during replacement; รหัส 80 is the most common AC220V coil for China market;
Prioritize AX new model for spare parts procurement, genuine brand-new A series stock is nearly unavailable.

เอบีบี A185-30-11-80 Contactor Application Cases (เอซี-3 400V, suitable for 75kW 3-phase motor, คอยล์ AC220V, built-in 1NO+1NC auxiliary)

หมายเหตุ: A series is discontinued. AX185-30-11-80 shall be adopted for new projects. Mounting and wiring logic are identical for all cases below.

กรณี 1: Heating Station Circulating Water Pump (DOL Direct-On-Line Starting)

โหลด: 75kW hot water circulating pump, 380วี, for industrial/municipal heat exchange stations, primary chilled water pumps of large commercial HVAC systems

การกำหนดค่า: A185-30-11-80 + TA200DU thermal relay (setting range 140~200A) + moulded case circuit breaker for protection

ตรรกะการควบคุม: บมจ / local pushbutton start-stop; built-in 1NO for run feedback, 1NC for interlock

คุณสมบัติ: Continuous stable operation; AC-1 resistive rating 250A ideal for steady pump loads; auxiliary contacts send status signals to BMS building management system

หมายเหตุความเสี่ยง: Derating and cabinet cooling fan required in summer for enclosed cabinets; avoid frequent cycling

กรณี 2: Variable Frequency Multi-Pump Cabinet, Mains Bypass Contactor

โหลด: 75kW main water supply pump for constant-pressure water supply, วีเอฟดี + mains dual circuit

โครงการ: Contactor at VFD output + A185 mains bypass contactor, mechanical interlock accessory fitted between two contactors

ตรรกะ: Pump runs via VFD under normal condition; upon VFD fault, PLC opens VFD circuit and closes A185 bypass to run motor directly on mains for uninterrupted water supply

ข้อกำหนดที่สำคัญ: ไฟฟ้า + mechanical interlock mandatory to prevent catastrophic parallel connection of VFD output and mains; 1NO/1NC for bypass status feedback and interlock signals

อุตสาหกรรม: Water treatment plants, sewage plants, high-rise secondary water supply, park water supply

กรณี 3: Soft Starter Bypass for Screw Air Compressor Main Motor (matched with ABB PSTX soft starter)

โหลด: 75kW screw air compressor main motor

โครงการ: ABB PSTX soft starter + A185-30-11-80 bypass contactor

กระบวนการ: After soft start completes and current drops, PLC energizes A185 to short-circuit the soft starter; motor runs continuously via bypass contactor to reduce heat loss on soft starter thyristors

ข้อได้เปรียบ: Air compressor is heavy inductive load; bypass configuration greatly extends soft starter service life. 5 million mechanical cycles suit compressor stations with multiple daily starts

เครื่องประดับ: CAL18 side-mounted auxiliary contact expansion, RC surge suppressor to absorb coil back EMF

กรณี 4: Dust Removal Fan / Induced Draft Fan Control (Boiler & Dust Treatment)

โหลด: 75kW centrifugal induced draft fan, main baghouse dust fan, for cement plants, chemical plants, waste incineration facilities

ควบคุม: DCS remote start-stop, interlocked with differential pressure, temperature and vibration signals; A185 switches main circuit, thermal relay for overload protection

ลักษณะการดำเนินงาน: ความเฉื่อยสูง, long start duration; not suitable for frequent jogging; usually DOL start or soft start + bypass

Selection note: AF wide-voltage AC/DC series is preferred if frequent forward/reverse operation is required

กรณี 5: Main Contactor for Star-Delta Reduced-Voltage Starting (KM Main)

โหลด: 75kW high-power motor, star-delta starter cabinet

Cabinet combination: 1 A185 as main contactor KM1 + 2 smaller contactors for star and delta switching

Suitable for sites with limited grid capacity and strict inrush current limits; auxiliary contacts send start-phase and completion feedback to PLC

คำเตือน: Transient impulse current occurs during star-delta transition, accelerating contact wear compared with standard DOL; regular inspection of contact erosion required

กรณี 6: Capacitor Bank Switching in Low-Voltage Reactive Power Compensation Cabinet (AC-1 resistive load)

โหลด: Low-voltage power factor correction capacitor bank, total 3-phase capacitor current ≤250A (A185 AC-1 rating 250A)

หมายเหตุ: Capacitor switching belongs to AC-1 resistive duty with high switching inrush current; standard A185 is only suitable for slow, infrequent switching. ABB dedicated UA capacitor contactors are recommended for high-frequency switching

แอปพลิเคชัน: Factory power rooms, commercial power distribution boards, low switching frequency (≤10 times per day)

กรณี 7: Heavy-Duty Belt Conveyor Drive (การทำเหมืองแร่ / Sand & Aggregate / วัสดุก่อสร้าง)

โหลด: 75kW main drive motor for sand transport, mining feed conveyor

สภาพการทำงาน: Heavy start torque, risk of stall; A185 + TA200DU thermal relay + stall interlock

ข้อจำกัด: A series has poor AC-4 performance for frequent reversing and jogging; AF series upgrade is recommended

✅ General Selection & Site Reminders

Coil code 80 = AC220V, most widely used in domestic control cabinets; AF wide-voltage coil is recommended for sites with large voltage fluctuation
Built-in 1NO+1NC satisfies standard feedback; add CAL18 side auxiliary blocks if more signal points are needed
Replacement note: A series discontinued; AX185-30-11-80 is direct replacement with identical cutout, wiring and accessories
Protection matching: MCCB for short-circuit protection + TA200DU thermal relay for overload protection

Operating Principle of ABB A185-30-11-80 AC Contactor

This is an electromagnetic AC contactor. Its core function is using electromagnetic force to drive mechanical linkage to switch main and auxiliary contacts. Coil code 80 means AC220V coil, built-in 1NO+1NC auxiliary contacts, 3-pole main contacts for 3-phase motors, ปั๊ม, fans and other loads.

หมายเหตุ: A series discontinued; AX185 shares identical working principle.

Main Internal Components
Electromagnetic coil (excitation coil): Control circuit component, energized by AC220V to generate alternating magnetic field
แกนคงที่, moving core (กระดอง): Magnetic circuit. Fixed core is stationary; moving core couples with contact carrier. A shading ring is embedded on the end face of fixed core, เฉพาะคอนแทคเตอร์ AC.
ผู้ติดต่อหลัก (3 pairs of normally open main contacts): Carry high current to switch 380V main loads (มอเตอร์, pumps etc.)
ผู้ติดต่อเสริม (built-in 1NO+1NC): Low-current signal contacts for latching, เชื่อมต่อกัน, ดำเนินการตอบรับ, PLC/DCS signalling
Return spring: Pushes moving core back and opens contacts when coil is de-energized
รางโค้ง: Elongates and cools electric arc during contact separation, extinguishes arc to prevent contact melting and phase-to-phase short circuit
Complete Working Sequence

2.1 คอยล์มีพลัง (pull-in stage)

AC220V rated voltage applied to control coil → alternating magnetic field generated, fixed core magnetized and electromagnetic attraction produced.

Attraction overcomes the force of return spring and contact pressure springs, pulling moving core down to close.

Linked mechanism operates synchronously:

3 pairs of main NO contacts close, 3-phase main circuit energized, motor/load starts running

Auxiliary contacts switch simultaneously: ไม่ปิด, เอ็นซีเปิด

The 1NO can be used for self-latching or sending run status to PLC; the 1NC is used for interlock and fault feedback.

✅ Shading ring function: AC magnetic field crosses zero every half cycle, causing temporary loss of attraction. Eddy current induced in shading ring creates a lagging magnetic field to maintain suction and eliminate hum and chatter of the core.

2.2 Coil continuously energized (holding stage)

Core stays closed, main circuit remains conductive.

Coil consumes low holding power (much lower than pull-in inrush power). Contact springs maintain adequate contact pressure to reduce contact resistance and avoid overheating under high current.

2.3 คอยล์ไม่ทำงาน (ปล่อย & breaking stage)

Control circuit de-energized → magnetic field disappears, electromagnetic attraction vanishes.

Return spring rebounds and resets moving core:

3 ผู้ติดต่อหลักเปิดอยู่, main power supply disconnected

รีเซ็ตผู้ติดต่อเสริม: NO เปิด, เอ็นซีปิด

Arc forms at contact separation, cut and cooled by arc chute for arc extinction. Switching cycle completed.

Auxiliary Contact Logic (จุดสำคัญ)

A185-30-11-80 built-in 1NO+1NC:

คอยล์ไม่ทำงาน: NO open, NC closed

คอยล์มีพลัง: NO closed, NC open

They operate synchronously via mechanical linkage and are not independently controlled.

Key Performance & หมายเหตุการใช้งาน
It is a control switch: It does NOT provide short-circuit protection. It only performs remote electric switching. Upstream circuit breaker for short-circuit protection and thermal relay for overload protection are mandatory.
เอซี-3 (motor duty) characteristic: Make motor starting inrush current, break rated running current. Not suitable for frequent breaking of locked-rotor current (หน้าที่ของเอซี-4). Frequent reversing and jogging accelerate contact wear.
Arc quenching principle: Grid-type arc chute splits long arc into multiple short arcs, cooled by air for rapid extinction, suitable for inductive loads up to 690V.
Operating voltage window: 0.85~1.1×Uc. Low voltage causes insufficient suction, contact chatter and arcing damage.
Simple Control Example (Self-Latching Circuit)

Press start button → coil energized, คอนแทคเตอร์ดึงเข้า, built-in NO auxiliary contact closes and parallels across start button. When start button is released, coil remains energized via this NO contact (ล็อคตัวเอง). Press stop button, coil de-energized and contactor drops out.

ความเข้าใจผิดที่พบบ่อย

AC contactor cannot provide electrical isolation for maintenance. Upstream circuit breaker must be opened for service work.

Shading rings are only fitted on AC magnetic cores; DC contactors do not have shading rings.

Main contacts and auxiliary contacts are mechanically linked but electrically isolated. High main circuit current will not leak into low-voltage control signal circuits.

กฎการเข้ารหัสโมเดล (A185-30-11-80)

AXX-30-XX-XX

AXX: เฟรมเรตติ้งปัจจุบัน (A9～A300)
30: 3 ปกติเปิดผู้ติดต่อหลัก (3NO+0NC, standard for 3-phase motors)
Auxiliary contact definition:

00: ไม่มีผู้ติดต่อเสริมในตัว

11: 1NO+1NC (standard for this model)

22: 2โน+2เอ็นซี

Coil code (เลขสองหลักสุดท้าย)

รหัส	แรงดันไฟฟ้าคอยล์
81	เอซี24วี
83	เอซี48วี
84	AC110V
80	ไฟ AC220V (widely used in China)
85	AC380V

หมายเหตุ: A series discontinued; AX series with identical suffix is direct replacement with same mounting cutout and wiring.

Full 3-Pole Model List (30 main contact version, วงจรมอเตอร์)

Low current range (A9～A75)

A9, A12, A16, A26, A30, A45, A50, A75

Standard suffix: -30-10 / -30-11

Typical full part numbers:

A9-30-10-80, A26-30-11-80, A75-30-11-80

ปานกลาง & high power range (A95～A300, including A185)

Main models for pumps, แฟน ๆ, air compressors and star-delta starters:

A95, A110, A145, A185, A210, A260, A300

Auxiliary options for each frame (3-เสา 30 รุ่น)