Tel: 
Email: 
WhatsApp: Description
Key Technical Specifications
· Rated Current: 2050 A
· Coil Voltage: 100-250 V AC/DC
· Main Poles: 3
· Auxiliary Contacts: 1 NO + 1 NC (Built-in)
· Coil Type: Electronic (DC control)
· Mounting: Panel / DIN Rail
· Application: Heavy-duty motor control
· Standards Compliance: IEC 60947-4-1
· Coil Polarity: A1 Positive, A2 Negative
· OEM Part Number: 1SFL707001R7011
Product Introduction
ABB AF2050-30-11-70 is a heavy-duty AC/DC electronic contactor designed for high-current motor control applications. It operates reliably across a wide 100-250 V coil voltage range.Field testing confirms stable operation at 2050 A continuous load without excessive thermal rise. The integrated electronic coil accepts low-voltage PLC outputs directly, reducing control panel wiring complexity.
Installation & Configuration Guide
Preparation (10 min)
Verify coil voltage matches your control circuit (100-250 V AC/DC). Confirm panel space accommodates the AF2050 footprint. Gather torque tools per ABB specifications.Removal (5-10 min)
Lock out and tag out all power sources. Verify zero energy with a multimeter. Disconnect main power cables first, then control wires. Remove mounting hardware.Installation (10 min)
Position the AF2050-30-11-70 on the mounting plate. Torque main terminals to manufacturer spec. Connect control wiring — observe polarity (A1 = positive, A2 = negative).Power-On & Test (10 min)
Energize control circuit only. Verify contactor pulls in smoothly. Measure coil voltage under load (must remain within ±10% of nominal). Run motor through full cycle.
Troubleshooting Quick Reference
· Contactor fails to pull in: Check coil voltage at A1/A2 terminals. Verify polarity. Measure actual voltage — must exceed minimum pull-in threshold.
· Excessive coil heat: Coil voltage too high. Measure with true RMS meter. Electronic coils are sensitive to overvoltage.
· Intermittent operation: Loose control wiring. Torque all terminal screws. Check PLC output card for voltage drop under load.
· Contact welding: Overload event occurred. Inspect main contacts. Verify motor FLA does not exceed 2050 A rating.
· Chattering noise: Insufficient coil voltage or contaminated pole faces. Measure voltage during pull-in sequence.
Dimensions, Mounting & Wiring Notes
· Dimensions: Refer to ABB AF2050 dimensional drawing (1SFL707001R7011)
· Mounting: Vertical panel mount only. Maintain clearance per IEC 60947-1.
· Terminal Notes: Main terminals require crimped lugs. Control terminals accept solid or stranded wire. Torque values specified in ABB manual.
FAQ
Q: Will this replace my old A-series contactor?
A: Not directly. The AF2050-30-11-70 uses an electronic DC coil, unlike the AC coils in legacy A-series units. You must verify control circuit compatibility before ordering.Q: I need 50 units — what’s the lead time?
A: Current stock supports immediate shipment for quantities under 20. For 50+ units, allow 4-6 weeks for factory allocation. Request formal quote for volume pricing.Q: What happens if I wire the coil backwards?
A: The AF2050 electronic coil has polarity protection. Reversed polarity simply prevents energization — no damage occurs. But correct wiring (A1+, A2-) is still required for reliable operation.Q: Can I use this with a 24V PLC output?
A: Yes. The 100-250 V AC/DC coil range accepts low-voltage control signals. However, verify your PLC output can source sufficient current for the electronic coil’s inrush demand.Q: Is this genuine ABB or aftermarket?
A: 100% original ABB. Every unit ships with traceable lot documentation. We do not sell refurbished or counterfeit units.Q: How do I know the coil voltage is correct?
A: Check the coil voltage code on the contactor label. “-70” indicates 100-250 V AC/DC. Cross-reference with your control transformer or power supply output.Q: Got any tips for first-time installers?
A: Always photograph the existing wiring before disconnection. The AF2050 terminal layout differs from older models. Also, double-check that your control power supply can handle the electronic coil’s startup current draw — undersized supplies cause the most common field failures.
