Siemens Industrial Controls 75D73070A Coil

The Siemens 75D73070A Replacement Coil is a high-performance magnetic component engineered for heavy-duty industrial switching. Designed for NEMA Size 00 through 2.5 starters and contactors, this dual-voltage 120/240V AC coil (110-120/220-240V) provides reliable actuation across standard control circuits. This specific model is a critical Siemens motor starter accessory for HVACR and industrial automation systems, frequently used with Class 14, 17, 18, 22, 25, 26, 30, 32, 40, and 43 equipment. The Siemens 75D73070A is an encapsulated unit, offering superior resistance to environmental contaminants and heat compared to open-wound alternatives. Featuring a standard 180 VA rating and 60Hz frequency optimization, it ensures consistent magnetic flux for reliable contact closure, even in high-cycle applications. Whether used for initial installation or as a field replacement, this coil delivers the precise electrical characteristics required to maintain the structural integrity of your motor control center and avoid contact welding or chattering.

• Multi-Voltage Versatility: Dual-rated for 110-120V and 220-240V applications, simplifying inventory for field technicians.
• Broad NEMA Compatibility: Designed for an exact fit in Siemens and Furnas NEMA size 00, 0, 1, 2, and 2.5 contactors.
• Rugged Encapsulation: The molded construction protects internal copper windings against vibration, dust, and moisture for long-term reliability.
• Streamlined Installation: Features integrated screw terminals for secure lead connections and standard mounting for rapid swap-outs.

Is the 75D73070A compatible with older Furnas brand contactors?
Yes, as Siemens acquired Furnas Electric, this coil serves as the direct OEM replacement for Furnas 75D series components in the specified NEMA sizes.

How do I wire this coil for 240V vs 120V?
Technicians must follow the internal wiring diagram; typically, dual-voltage coils utilize specific jumper configurations or series/parallel connections at the screw terminals to match the control circuit voltage.

What causes a contactor coil to fail prematurely?
Common failure points include overvoltage, undervoltage (causing chattering), or debris in the magnetic air gap that leads to excessive heat and burnout.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.