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MDI Mercury Relays, Solid State Relays and Switches
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  • Level & Pressure Controls
    • Mercury Hg Floats
      • Mini Pilot Duty | Control Floats
      • Pilot Duty | Control Floats
      • Pump Duty Intermediate Angle Floats
      • Pump Duty Wide Angle Floats
      • Foam-Filled Mercury Sewage Floats
    • Mechanical Floats
      • Pump Duty Wide Angle Floats
      • Pump Duty Narrow Angle Floats
      • Heavy Duty Floats
      • Pilot Duty | Control Floats
    • Specialty Float Switches
      • Internally Weighted | Tetherless Floats
      • Gold Plated Contact Floats
      • High Amp - 25 AMP Floats
      • High Temperature Floats
      • Mini Floats
        • Normally Open (Pump Down)
        • Single Pole Double Throw
        • Double Pole Single Throw
      • Dual Float Alarm System
    • Avocado Float Switches
      • Avocado Mercury Floats
      • Avocado Pump Duty Wide Angle Float
      • Avocado Pump Duty Narrow Angle Float
      • Avocado Heavy Duty Float
      • Avocado Pilot Duty | Control Floats
    • Specialty Avocado Float Switches
      • Avocado Internally Weighted | Tetherless Floats
      • Avocado Gold Plated Contact Floats
      • Avocado High Amp - 25 AMP Floats
      • Avocado High Temperature Float
      • Avocado Floats DPST | DPDT
        • Double Pole Single Throw
        • Double Pole Double Throw
      • Avocado Double Float Switch
    • Vertical Switch
      • 1/2 HP Pump Duty Switch
      • 1 HP Heavy Duty Switch
      • 2 HP Heavy Duty Switch
    • Optical Float®
      • Optical Float® Original Floats
      • Optical Float® Mini Floats
      • Opti-Float® Accessories
      • Opti-Float® FAQ
    • Stainless Steel Floats
      • Float Switch
      • Vertical Floats
    • Float Accessories
      • Float Mounting
      • Sway Rings
      • Tether Clamps
      • Weight Kits
    • Miscellaneous & Info
      • GFCI Receptacles
      • Switching Cord Sets
      • Installation Guide
    • Pressure Controls
      • Pressure Transducers
      • Pressure Transmitter
      • Pressure Switch
    • Ultrasonic Leveling and Accessories
      • Ultrasonic Level Sensor
      • Ultrasonic Level Transmitter
      • Ultrasonic Level Accessories
    • Panels & Alarms
      • Tank Alarms (High Water Alarm)
      • Control Panels
      • Pump Controllers
      • Enclosures
      • Junction Boxes
  • Pumps & Basins
    • Basin Packages
      • Fiberglass Basins
      • Complete Simplex Basin Packages
      • Complete Duplex Basin Packages
      • Custom Basin Packages
      • Basin Miscellaneous Accessories
    • Guide Rail Systems & Accessories
      • Base Elbow Rail Systems
      • Lift-Out Flange
      • Stainless Steel Pump Adapter
      • Guide Rail Brackets
      • Chains & Components
    • Septic & Pump Tanks
      • Pump Tanks
      • Septic Tanks
      • All In One Tanks
      • Caddy Box - Plug-in Junction Box
      • Gravity Flow Effluent Filter
    • Grinder Pumps
      • Grinder Pumps
      • Grinder Pump Retrofits
        • ABS Retrofit
        • Barnes Retrofits
        • E/One® Retrofit
    • Non-Clog Pumps & Accessories
      • Recessed Impeller - 3 & 4 Inch Discharge
      • 2-Vane Enclosed Impeller - 3 & 4 Inch Discharge
      • 2-Vane Enclosed Impeller - 4 to 14 Inch Discharge
      • Accessories
    • Shredder Pumps
    • Effluent, Sump & Sewage
      • Effluent Pumps
      • Sump Pumps
      • Sewage Pumps
    • Miscellaneous Accessories
      • Base Elbows
      • Lift-Out Flanges
      • Chains
      • Shackles, Quick Links & Eye Bolts
      • Tank Vents
      • Inlet Hubs and Full Couplings
      • Guide Brackets
      • Check Valves & Pump Flanges
      • Gate Valves & Rods
    • Pump Repair
      • General Information
      • Preventive Maintenance
      • Sump and Sewage Pump Repair
      • Well Pump Pump Repair
      • Sprinkler and Irrigation Pump Repair
      • Grinder Pump Repair
      • Cutter | Chopper | Shredder Repair
  • Solid State Relays
    • Single Pole SSR Series
      • Economy Grade
      • Commercial Grade
        • SS20 Series
        • SS30 Series
        • SS40 Series
        • SS60 Series
        • SS90 Series
    • HPR Series
      • Economy Grade
      • Commercial Grade
        • 25 AAC Relays
        • 50 AAC Relays
        • 75 AAC Relays
        • 100 AAC Relays
      • 3 Phase | 3 Pole HPR Series
    • HPRs for DC Loads
    • 2 & 3 Pole Series
      • Mercury Free 35A, 60A & 100A Retrofit
      • 2 Pole Series
      • 3 Pole Series
    • Misc. Solid State
      • Switching Power Supply
      • Heater Burnout Relays
      • Temperature Controller
  • Switches
    • Tilt Switches
      • Mercury Free Switches
      • Mercury Switches
      • Specialty Switches
    • Damper Arm Tilt Switch
      • Mercury Free Switches
      • Mercury Switches
    • Tip-Over Switches
      • Mercury Free Switches
      • Mercury Switches
    • Limit Switch
    • Clamps & Clips
  • Mercury Relays
    • Single Pole Relays | Contactors
      • Single Pole 30 AMP
      • Single Pole 35 AMP
      • Single Pole 35 AMP T-Top
      • Single Pole 60 AMP
      • Single Pole 100 AMP
    • Two Pole Relays | Contactors
      • Two Pole 30 AMP
      • Two Pole 35 AMP
      • Two Pole 35 AMP T-Top
      • Two Pole 60 AMP
      • Two Pole 100 AMP
    • Three Pole Relays | Contactors
      • Three Pole 30 AMP
      • Three Pole 35 AMP
      • Three Pole 35 AMP T-Top
      • Three Pole 60 AMP
      • Three Pole 100 AMP
    • Four Pole Relays | Contactors
      • Four Pole 35 AMP
      • Four Pole 60 AMP
      • Four Pole 100 AMP
    • Misc. Products & Info
      • Traffic Control Relays
      • Mercury Timers
      • Temperature Controller
      • ETO Hybrid Timer
      • Spill Kit (SP-1149)
      • MOV (Metal Oxide Varistors)
      • Relay Information & Restrictions
  • Non-Mercury Relays
    • Midi Relays 3-Pole (IEC Contactors)
    • Definite Purpose Relays

Commercial Grade

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Home Solid State Relays HPR Series Commercial Grade
25 AAC Relays
25 AAC Relays
50 AAC Relays
50 AAC Relays
75 AAC Relays
75 AAC Relays
100 AAC Relays
100 AAC Relays

Contact Us

Phone: (269) 663-8574
Toll Free: (800) 634-4077
Fax: (269) 663-2924

Locate Us

MDI Inc.
P.O. Box 710
25028 U.S. 12 East
Edwardsburg, Michigan 49112

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MDI, Controls, Control Sys & Regulators, Edwardsburg, MI

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