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Electronic Motor Controls

Thern Accessories

Electronic Controls from Thern

Thern supplies operator-friendly control systems, from simple pendant contols to complete computerized networks involving the most complicated variable speed drives. From start to finish, Thern's in-house UL-rated panel shop allows for outstanding quality control.


Thern Cranes are available in a variety of custom configurations. Contact your mdi Rep. and let us help you choose the perfect Crane for your application


Electric Drum Control Switches

Model Description Voltage/Phase/Hertz Max HP Weight
115/1/60 230/1/60 230/3/60 460/3/60
10L2A1 NEMA 1 1.5 HP 2 HP 3 HP 3 HP 3 lbs
10L7E1 NEMA 1 1.5 HP 3 HP 5 HP 7.5 HP 3 lbs
10L2A4 NEMA 4 - Watertight 1.5 HP 2 HP 2 HP 2 HP 7 lbs
10L7E4 NEMA 4 - Watertight 1.5 HP 3 HP 5 HP 7.5 HP 7 lbs
10P1A46 6 ft Pendant Control   5 lbs
  • Single Speed Reversing Drum Controls for 1 and 3 phase motors up to 7.5 hp
  • UL and CSA Recognized components throughout.
  • Enclosures to suit your application needs. NEMA 1 (industrial) rated switches provide protection against dirt and corrosion for most indoor applications. NEMA 4 (watertight) rated switches keep dirt and water out, and are approved for most outdoor applications.
  • Wiring Diagram is supplied inside the enclosure for convenient reference.
  • Switches for 115 volt single phase motors up to 1 hp, include 8 ft power cord with grounded plug.

Read about Thern's 2-year Limited Warranty




Electric Motor Controls

Model Max. Horsepower for Power Supply Current Weight
115/1/60 230/1/60 208/3/60 230/3/60 460/3/60
10S2A4 1.5 HP   25 lbs
10S3B4   3 HP   25 lbs
10S3C4   3 HP   25 lbs
10S7C4 7.5 HP 25 lbs
10S10C4 10 HP 28 lbs
10S20C4 20 HP 28 lbs
10S3D4   3 HP   25 lbs
10S7D4 7.5 HP 25 lbs
10S10D4 10 HP 28 lbs
10S20D4 20 HP 28 lbs
10S30D4 30 HP 60 lbs
10S7E4   7.5 HP 25 lbs
10S15E4 15 HP 25 lbs
10S20E4 20 HP 28 lbs
10S40E4 40 HP 60 lbs
10S60E4 60 HP 60 lbs
  • Single Speed Reversing Magnetic Controls for 1 and 3 phase motors up to 60 hp
  • UL, IEC, or CSA Recognized components throughout.
  • Steel Enclosure NEMA 4 rated (watertight) keeps dirt and water out. Approved for most outdoor applications.
  • Pendant Control Switch NEMA 4X rated (watertight), on 50 foot cord, allows operator to stand away from winch during operation. Pendant control is operated with momentary contact-type push buttons. Cord lengths of less than 50 feet are available, please specify when ordering.
  • Reversing Contactor is electrically and mechanically interlocked to deliver smooth reversing control.
  • Thermal Overload Relay trips power OFF to protect motor from overheating. Switch is manually reset.
  • Fused Control Circuit powers pendant with 115 volt, 2 amp current to help protect against high voltage shocks.
  • Wiring Diagram is supplied inside enclosure.
  • Steel Mounting Bracket secures control box to winch.

  • Options
  • Special current or horsepower ratings
  • Special rated enclosures for explosive or harsh environments
  • Multi-speed controls
  • Torque limiting controls
  • Power cord disconnects
  • Various selector switches and pilot lights

Read about Thern's 2-year Limited Warranty




Varible Frequency Drives

Model Description Voltage/Phase/Hertz Max. HP Weight
230/3/60 460/3/60
10V1D12L 10:1 Variable Speed Drive 1 HP   100 lb
10V2D12L 10:1 Variable Speed Drive 2 HP   100 lb
10V3D12L 10:1 Variable Speed Drive 3 HP   100 lb
10V5D12L 10:1 Variable Speed Drive 5 HP   100 lb
10V7D12L 10:1 Variable Speed Drive 7.5 HP   120 lb
10V10D12L 10:1 Variable Speed Drive 10 HP   120 lb
10V15D12L 10:1 Variable Speed Drive 15 HP   120 lb
10V20D12L 10:1 Variable Speed Drive 20 HP   210 lb
10V25D12L 10:1 Variable Speed Drive 25 HP   210 lb
10V1E12L 10:1 Variable Speed Drive   1 HP 100 lb
10V2E12L 10:1 Variable Speed Drive   2 HP 100 lb
10V3E12L 10:1 Variable Speed Drive   3 HP 100 lb
10V5E12L 10:1 Variable Speed Drive   5 HP 100 lb
10V7E12L 10:1 Variable Speed Drive   7.5 HP 100 lb
10V10E12L 10:1 Variable Speed Drive   10 HP 100 lb
10V15E12L 10:1 Variable Speed Drive   15 HP 120 lb
10V20E12L 10:1 Variable Speed Drive   20 HP 180 lb
10V25E12L 10:1 Variable Speed Drive   25 HP 180 lb
  • Variable Frequency Drive controls are available to provide accurate positioning of loads, soft starts and soft stops, and overload protection.
  • For 3 phase 230 VAC and 460 VAC motors from 1 to 5 hp.
  • For 3 phase 230 VAC motors from 1 to 30 hp.
  • For 3 phase 460 VAC motors from 1 to 60 hp.

Read about Thern's 2-year Limited Warranty