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MDI 335NO-120A Mercury Displacement Contactor
SPECIAL OFFER: $49.95
The MDI 335NO-120A mercury displacement contactor delivers bounce-free 3-pole switching for resistive industrial loads, with a 120 VAC coil and a 35 A-per-pole rating at up to 600 VAC.
Detailed Overview
Three-Pole Resistive Load Switching with the MDI 335NO-120A Contactor
The MDI 335NO-120A is a three-pole, normally open mercury displacement contactor. It uses a 120 VAC control coil to switch resistive AC loads rated up to 35 A per pole and 600 VAC. Its vertically mounted contact system is intended for high-cycle industrial control service.
Mercury Displacement Switching with Gravity-Based Contact Operation
- Energizing the 120 VAC coil actuates the internal contact mechanism and displaces liquid mercury to complete three normally open circuits.
- The mercury contact medium forms a continuous conductive path without conventional mechanical contact bounce.
- De-energizing the coil allows the mercury to return under gravity and open the load circuits.
- Vertical installation within the specified mounting tolerance maintains the required mercury position for proper opening and closing behavior.
Electrical Ratings and Defined Operating Characteristics
- Three normally open poles provide simultaneous control of three resistive load circuits.
- Each pole is rated for a continuous load of 35 A.
- The maximum switching voltage is 600 VAC for resistive loads.
- The 120 VAC, 50/60 Hz coil has a stated current draw of 159 mA, resistance of 416 ohms, and power requirement of 19.2 VA.
- Specified operating characteristics include 50 ms operate time, 80 ms release time, 0.003-ohm contact resistance, and 2,500 VAC RMS dielectric strength.
Industrial Heating and Resistive Load Control
- Industrial heater-band switching
- Oven and process-heating control
- Resistive load switching in high-cycle industrial control systems
Key Benefits
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✓Fully Tested & Certified
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✓30-Day Risk-Free Returns
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✓1-Year Full Warranty
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✓Professional Calibration Services
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✓Trade-In Program Available
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✓Fast & Reliable Delivery
What's in the Box
- 1 x MDI 335NO-120A Mercury Displacement Contactor
Technical Specifications
| Brand | Mercury Displacement Industries (MDI) |
|---|---|
| Model | 335NO-120A |
| Product Type | Mercury Displacement Contactor |
| Contact Configuration | 3-pole, normally open (3NO) |
| Load Rating | 35 A continuous per pole |
| Maximum Switching Voltage | 600 VAC |
| Load Type | Resistive only |
| Coil Voltage | 120 VAC, 50/60 Hz |
| Coil Current | 159 mA |
| Coil Resistance | 416 ohms |
| Coil Power | 19.2 VA; 10.5 W |
| Contact Resistance | 0.003 ohms after cycling under load |
| Dielectric Strength | 2,500 VAC RMS |
| Operate Time | 50 ms |
| Release Time | 80 ms |
| Coil Terminals | #6 binding-head screws; 7 in-lb torque |
| Load Terminals | Compression terminals for 4–14 AWG wire; 31.5 in-lb torque |
| Operating Temperature | -31°F to 185°F (-35°C to 85°C) |
| Mounting Orientation | Vertical within ±10 degrees |
| Gas Fill | Argon |
| Agency Markings | CE, UL, CSA |
| Net Weight | 2.4 lb |
| Approximate Product Dimensions | 10-1/8 × 3-1/16 × 2-11/16 in |
Full Warranty Protection
1 Year Comprehensive Coverage
(Including Calibration Support & Trade-In Options)
(Including Calibration Support & Trade-In Options)
24/7 Customer Support
Contact Us
Toll Free: (833) 322-7865
Local: (469) 470-9378
Email: sales@cartoli.com