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DIN-A-MITE C Power Controller

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The DIN-A-MITE C silicon controlled rectifier (SCR) power controller provides a low cost, compact and versatile solid state option for controlling electric heat. This controller is designed and manufactured with the quality features expected from Watlow. DIN-rail and standard panel mounting plus a cabinet thru-wall mount version are available.

Basic features include single-phase, three-phase/two leg, and three-phase/three leg, 24-600VAC operation. Current switching capabilities range from 30 to 80A depending on the model ordered.

Variable time base, linear voltage and current process control or VAC/VDC input contactor versions are available. Single-phase, phase angle firing and current limiting are also available. All configurations are model number dependent and factory selectable. This power controller includes 200KA short circuit current rating (SCCR) tested up to 480VAC to prevent arch flash with required fusing.

Features and Benefits · Specifications · Additional Specifications for Contactors and Proportional Controllers · Additional Specifications for Phase Angle, Phase Angle Current Limit and Single Cycle Variable Time Base · Extended Heater and Power Controller Life with Variable Time Base · Loop Powered or Transformer Powered

Features and Benefits


  • Prevents arc flash

    DIN-rail and standard panel mount thru-wall mounting

  • Provides versatility, quickness and low-cost installation

    Compact size

  • Reduces panel space and cost

    Touch-safe terminals

  • Increases safety for installer/user

    One and three-phase power

  • Can be used in a variety of applications

    Open heater/shorted output alarm

  • Notifies the user in case of an open heater or shorted output

    Mercury free

  • Environmentally safe

    Faster switching with solid state

  • Saves energy and extends heater life

    UL® 508 listed, C-UL® and CE with filter

  • Meets applications requiring agency approval

    System solution component

  • Provides single source thermal loop

    Back-to-back SCR design

  • Ensures a rugged design

  • Specifications

    Operator Interface
    • Command signal input and indication light
    • Alarm output and indication light
    • Current limit indication LED
    Amperage Rating
    • See output rating curves.
    • Max. surge current for 16.6ms, 1,350A peak
    • Max. I2t for fusing is 9100A2s
    • Latching current: 200mA min.
    • Holding current: 100mA min.
    • Fan current: 0.14A for 24VDC; 0.12A for 120VAC; 0.06A for 240VAC
    • Off-state leakage 1mA at 77ºF (25ºC) max.
    • Power dissipation: 1 watt per amperes per leg switched
    • 200KA SCCR, Type 1 and 2 approved with the recommended fusing.
    Line Voltage
    • 24 to 48VAC units: 20.4VAC min. to 53VAC max.
    • 100 to 240VAC units: 48VAC min. to 265VAC max.
    • 277 to 600VAC units: 85VAC min. to 660VAC max.
    • 100 to 120VAC, 200 to 208VAC, 230 to 240VAC, 277VAC, 400VAC, 480VAC, 600VAC, +10/-15%, 50 to 60Hz independent ±5% (Input control signal Type L, P and S)
    Alarms (zero-cross models only)
    Shorted SCR Alarm Option
    • Alarm state when the input command signal is off and a 10A or more load current is detected by the current transformer (two turns required for 5A and three turns for 2.5A)
    Open Heater Alarm Option (Input Control Signal Type S only)
    • Alarm state when the input command signal is on and the load current detected by the current transformer is 20% less than customer adjusted set point
    Alarm Output
    • Energizes on alarm, non-latching
    • Triac 24 to 240VAC, external supply with a current rating of 300mA @ 77ºF (25ºC), 200mA @ 122ºF (50ºC), 100mA @ 176ºF (80ºC) and a holding current of 200µA with a latching current of 5mA typical
    Agency Approvals
    • CE with proper filter:
      204/108/EC electromagnetic compatibility directive
      EN 61326-1: industrial immunity Class A emissions not suitable for Class B environments
      Phase angle and phase angle with current limit input control signal Types (P and L) are not CE approved for conducted or radiated emissions
      2006/95/EC low voltage directive EN 50178 safety requirements installation category III, pollution degree 2
    • UL® 50 Type 4X enclosure, Class 1, Div. 2 per ANSI/ISA 12.12.01. Thru-wall heat sink models T4A File 184390
    • cULus® UL® 508 listed and C-UL® File E73741
    • Shock and vibration tested to IEC 60068-2-32
    • Vibration tested to IEC 60068-2-6
    Input Terminals
    • Compression: will accept 24 to 16 AWG (0.2 to 1.5 mm2) wire
    • Torque to 4.4 in. lb (0.5 Nm) max. with a 1/8 in. (3.5 mm) blade screwdriver
    Line and Load Terminals
    • Compression: will accept 14 to 4 AWG (2 to 21 mm2) wire
    • Torque to 24 in. lb (2.7 Nm) max. with a 1/4 in. (6.4 mm) blade screwdriver, or a type 1A, #2 Pozi driver
    Operating Environment
    • See the output rating curve chart on next page
    • 0 to 90% RH (relative humidity), non-condensing
    • Storage temperature: -40 to 185ºF (-40 to +85ºC)
    • Insulation tested to 3,000 meters
    DIN-Rail Mount
    • DIN EN 50022, 35 mm by 7.5 mm
    Back Panel Mount
    • Four mounting holes No. 6 to No. 8 (M3 to M4) fastener
    Through-Wall Mount
    • Note: Mount cooling fins vertically.

    Additional Specifications for Contactors and Proportional Controllers

    Control Mode, Zero-Cross
    • Input control signal Type C: VDC input contactor
    • Input control signal Type K: VAC input contactor
    • To increase service life on contactor input models the cycle time should be less than three seconds
    • Input control signal Type F: 4 to 20mA DC proportional variable time base control
    Input Command Signal
    • AC contactor
      24VAC ±10%, 120VAC +10/-25%, 240VAC +10/-25% @ 25mA max. per controlled leg
    • DC contactor
      4.5 to 32VDC: max. current @ 4.5VDC is 6mA per leg, add 2mA per LED used to the total current
    • Loop powered linear current 4 to 20mA DC: loop-powered, input Type F0 option only, no more than three inputs connected in series

    Additional Specifications for Phase Angle, Phase Angle Current Limit and Single Cycle Variable Time Base

    • Burst firing (zero-cross) control, single-cycle variable time base, Type S single phase and 3-phase. Unit is not on for more than one full cycle under 50% power and not off for more than one full cycle above 50% power
    • Phase-angle control, single-phase only
    Input Command Signal
    • 0 to 20mA, 4 to 20mA, 0 to 5VDC, 1 to 5VDC and 0 to 10VDC
    • Input impedance 250Ω for 4mA to 20mA, 5kΩ for linear voltage input
    Output Voltage
    • 100 to 120VAC, 200 to 208VAC, 230 to 240VAC, 277VAC, 400VAC, 480VAC and 600VAC, ±10%
    Linearity (Input Control Signal Type S)
    • ±5% input to output power over 0 to 100% of span between calibration points
    Linearity (Phase Angle Input Control Type P and L)
    • ±5% input to output power, as referenced to a sinusoidal power curve, between calibration points
    • Better than 0.1% of input span with respect to output change
    Soft Start (Phase Angle Input Control Signal Type P and L)

  • 5 seconds soft start on power up
  • Soft start on thermostat over temperature
  • Soft start on 1/2 cycle drop out detection
  • 1 second soft start on set point change


  • Manual control kit (1kΩ potentiometer) 08-5362
  • Alarm option is not available on phase-angle input control signal Type P or L

    Specifications are subject to change without notice.

  • Extended Heater and Power Controller Life with Variable Time Base

    With variable time base control, the power controller automatically adjusts the time base and output power with respect to command signal. Accelerated life testing shows that variable time base control significantly reduces expansion and contraction of the heater element. This extends heater and power controller life while improving process temperature control. This saves money on heaters, downtime and maintenance.

    Loop Powered or Transformer Powered

    Loop Powered or Transformer Powered

    Loop Powered

    By using a temperature controller 4-20mA process output signal as the power supply for the DIN-A-MITE input the cost of the power controller can be reduced. With zero cross (burst fired) the 4-20mA input signal simultaneously performs the tasks of providing a power supply and an input command signal. The DIN-A-MITE "F0" input control signal is a loop powered option and will work as single- or three-phase. It works only with a 4-20mA input.

    Transformer Powered

    Some DIN-A-MITE models require an on-board power supply to power the internal electronics. Phase-angle options require the detection of zero cross of the ac sine wave and thus a transformer is also required. DIN-A-MITE input control signal types "L", "P" and "S" are transformer powered and can be controlled manually (open loop) with a potentiometer input or in the auto mode (close loop) with a temperature controller using any of the 4-20mA, linear voltage (0-5, 1-5 and 0-10VDC) input types.

    Loop Powered 4-20mA Variable Time Base

    Loop Powered 4-20mA Variable Time Base
    Loop Powered 4-20mA Variable Time Base
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    Phase Angle

    Phase angle control (input control signal options L and P) is infinitely variable over the period of the ac sine wave. It provides a variable voltage and/or current output. These options include soft start and current limiting. The phase angle circuitry is transformer powered and accepts a linear voltage, current or potentiometer input. This option is available only for single-phase switching.
    Phase Angle

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    Single Cycle Variable Time Base

    With single-cycle variable time base control, at 50 percent power, power is on one cycle and off one cycle. At 25 percent, it is on for one cycle and off for three. Under 50 percent, the unit is not on for more than one consecutive cycle. Over 50 percent, the unit is not off for more than one consecutive cycle. This model will work with a linear voltage input, a 4 to 20mA input or a potentiometer input.
    Single Cycle Variable Time Base

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    · Output Rating Curves - 1

    · Output Rating Curves - 2

    · Output Rating Curves - 3

    · Style C Dimensions Without Cooling Fan

    · Thru-Wall Style C

    · With Cooling Fan

    · Recommended Semiconductor Fuse for Applications Through 600VAC


    DFJ Fuses

    DFJ Fuses

    DFJ Single Fuse Holder

    DFJ Single Fuse Holders