DC 110V 33 Ohm Closing and Tripping Coil

Dongfa Intelligent factory-direct DC 110V 33 Ohm Closing and Tripping Coil: 33Ω ±5%, ~3.33A steady-state current, ~367W instantaneous power, equivalent to DC220V 131.5Ω; lead wire connection, double-ended shaft, brass push rod with locking nut, external reset spring, galvanized housing, 6 top threaded holes in two symmetrical rows; for high voltage vacuum circuit breaker DC110V control power; key selling point: DC110V 33Ω achieves power equivalent to DC220V 131.5Ω — ~3.33A and ~367W, almost identical to DC220V 131.5Ω coil's 368W, ensuring sufficient electromagnetic force under low voltage control power.

Core Advantages and Engineering Logic

DC110V 33Ω Achieves Power Equivalent to DC220V 131.5Ω

Steady-state current approximately 3.33A, instantaneous power approximately 367W, almost identical to DC220V 131.5Ω coil's 368W, ensuring sufficient electromagnetic force under low voltage control power. In a DC110V system, if a 131.5Ω coil is used, steady-state current is only 0.84A, instantaneous power approximately 92W, and electromagnetic force may be insufficient to drive the switching mechanism. According to Ohm's law, DC110V applied to a 33Ω coil gives steady-state current approximately 3.33A (110 ÷ 33 = 3.33) and instantaneous power approximately 367W (110² ÷ 33 ≈ 367). Compared with a DC220V 131.5Ω coil, voltage is halved, resistance is about 1/4, current is about 2 times, and power is equivalent. This design ensures that under DC110V control power, the closing/opening coil still provides sufficient electromagnetic force, with action force and switching time comparable to DC220V systems.

Double-Ended Shaft for Symmetrical Force and Reduced Push Rod Deflection

Push rod supported on both sides, balanced force, reducing unilateral deflection and wear under low voltage high current conditions, lowering mechanism jamming risk.

Lead Wire Connection: Reliable Soldering, Flexible Routing

Black multi-strand copper wire lead out, adapting to traditional soldering or crimping processes. Switchgear builders can freely choose according to cabinet wiring paths.

Brass Push Rod with Locking Nut: Adjustable Stroke

Brass push rod, non-magnetic, corrosion resistant, high machining precision. Locking adjustment nut fine-tunes push rod extension, adapting to different operating mechanisms.

Top 6-Hole Symmetrical Mounting for Stable Fixing

6 threaded mounting holes in two symmetrical rows provide more fixing point options, reducing loosening from switching impact.

Application Advantages

Symmetrical Force Under Low Voltage High Current

At DC110V, the 33Ω coil current reaches 3.33A, twice that of a DC220V 131.5Ω coil's 1.67A. Higher current means greater electromagnetic force and greater impact force on the push rod. This product adopts a double-ended shaft design. The push rod is supported on both sides of the coil bobbin, with more balanced force, reducing unilateral deflection and wear, especially important under low voltage high current conditions.

Brass Push Rod with Locking Nut

The push rod uses brass material, non-magnetic, not interfering with coil magnetic field distribution. The locking adjustment nut allows fine-tuning of push rod extension or initial position, adapting to operating mechanisms from different manufacturers and years. Secure with locking nut after adjustment to prevent loosening.

External Reset Spring

Rear external reset spring allows visible status and easy replacement. In DC110V systems, due to higher current, if switching actions are more frequent, spring fatigue risk increases accordingly. External springs facilitate direct observation and replacement during inspection, reducing maintenance difficulty.

Lead Wire Connection and Top 6-Hole Mounting

Lead Wire Connection

This DC 110V 33 Ohm Closing and Tripping Coil leads out through black multi-strand copper wires. Switchgear builders can freely choose soldering or crimping methods according to cabinet wiring paths. For switchgear builders with established lead wire soldering processes, no change to assembly procedures is required.

Top 6 Threaded Mounting Holes

Mounting hole positions vary among high voltage vacuum circuit breaker operating mechanisms from different manufacturers and years. The 6 threaded holes are arranged in two symmetrical rows, providing more mounting point options. Select 4 or 6 holes for fixing according to actual mechanism. Bolts with spring washers are recommended to prevent vibration loosening during switching. Threaded hole position accuracy is individually checked before shipment to ensure smooth bolt insertion.

Technical Specifications & Selection Guide

Full Technical Parameters

Key Points for Selection and Replacement

• Operating Voltage: DC110V — not for AC or DC220V.
• Coil Resistance: 33Ω — current approximately 3.33A, power approximately 367W, equivalent to DC220V 131.5Ω power.
• Shaft Type: Double-ended — confirm whether operating mechanism fits dual-end push rod layout.
• Wiring Method: Lead wire type — black dual lead wires.
• Reset Method: External spring self-reset.
• Push Rod Adjustment: With locking adjustment nut for fine tuning stroke.
• Mounting Holes: 6 threaded mounting holes on top face, two symmetrical rows.
• Duty Cycle: Short time duty — strictly no long term energization.

Company Strength

DC110V Low Resistance Coil Winding Process and Power Consistency Testing

Originally focused on high voltage electrical manufacturing, we have expanded into low voltage electrical and switchgear accessory categories, forming high/low voltage collaborative supply capability. The 33Ω low resistance coil has high requirements for winding process: thick wire, fewer turns, and difficult resistance deviation control. We assemble on dedicated low voltage lines. Each unit undergoes resistance testing and dielectric withstand testing before shipment. Coil resistance is individually verified to ensure 33Ω±5% consistency. Simulated short time energization testing verifies instantaneous action capability and matching with DC110V control power. Double-ended shaft push rod coaxiality and locking nut adjustment precision are also individually inspected before shipment.

High/Low Voltage Collaborative Supply to Reduce Supplier Management Costs

For switchgear builders, the benefit of high/low voltage collaborative supply is that high voltage and low voltage parts can be purchased from the same supplier, reducing coordination costs and improving matching consistency. Products have been exported to Southeast Asia and parts of Europe, adapting to different market standards and requirements. Certified to ISO 9001, ISO 14001, and ISO 45001; factory audits supported.

FAQ

Q1: What is the difference between DC110V 33Ω coil and DC220V 131.5Ω coil?

A: DC 110V 33 Ohm Closing and Tripping Coil at 110V has steady-state current approximately 3.33A and instantaneous power approximately 367W. DC220V 131.5Ω coil at 220V has steady-state current approximately 1.67A and instantaneous power approximately 368W. Power is equivalent but voltage and current differ and cannot be interchanged. Confirm control power voltage during selection.

Q2: Can a 33Ω coil replace a 131.5Ω coil?

A: No. DC110V and DC220V control power voltages differ and coil resistance designs differ. If a 33Ω coil is used on DC220V power, steady-state current reaches 6.67A and instantaneous power approximately 1467W, rapidly burning the coil and possibly damaging the control power. Strictly select according to control power voltage.

Q3: What are the current and power of DC110V 33Ω coil?

A: At DC110V, steady-state current approximately 3.33A, instantaneous power approximately 367W. Short time duty: energization time typically only tens to hundreds of milliseconds. Ensure control circuit auxiliary contact reliably cuts power after action. Long term energization is strictly prohibited.

Q4: What are the advantages of double-ended shaft in DC110V systems?

A: At DC110V, current is higher and impact force on push rod is greater. Double-ended shaft push rod supported on both sides, balanced force, reducing unilateral deflection and wear, lowering mechanism jamming risk, especially important under low voltage high current conditions.

Q5: What are the benefits of external reset spring and locking nut?

A: External spring allows visible status and easy replacement without disassembling the coil body. Locking nut fine-tunes push rod extension or initial position, adapting to operating mechanisms from different manufacturers and years.

Q6: Are you a factory or a trader? Do you support factory audits?

A: Dongfa Intelligent is an own factory in Yueqing, Zhejiang, founded in 2012, with 14 years of manufacturing experience. Factory audits are supported. You are welcome to visit.