Phase-angle regulation
Three sets of anti-parallel SCRs regulate the power delivered to a three-phase load.
← All power regulatorsMGR-SCR-H
THREE-PHASE / PHASE-ANGLE CONTROL
MGR-SCR-H
Series
Controlled power for industrial heating. An enclosed three-phase SCR regulator with adjustable output limits, clear status indicators and an integrated heat sink.
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01 / FEATURES
Power control.
With practical adjustment.
Adjustable output range
Set minimum and maximum output to suit the process and control requirements.
Visible operating status
LED indicators make power, input and output status easy to check at the unit.
Integrated thermal design
A built-in heat sink and model-specific cooling assembly simplify cabinet integration.
02 / MODEL RANGE
Choose your current rating.
Models featured in this product range. Specify the load current, supply voltage and required control signal when ordering.
MGR-SCR-40LA-H40 A
MGR-SCR-60LA-H60 A
MGR-SCR-80LA-H80 A
MGR-SCR-100LA-H100 A
MGR-SCR-120LA-H120 A
MGR-SCR-300LA-H300 A
03 / PRODUCT VIEWS
A closer look.
Four views of MGR-SCR-60LA-H. Select a photograph to enlarge it.
04 / PARAMETERS
Electrical reference.
Control signal optionsE: 0–5 V DC · F: 0–10 V DC · G: 4–20 mA
Nominal main supplyThree-phase 380 V AC
Frequency50 / 60 Hz
Output controlPhase-angle control using three sets of anti-parallel SCRs
Output adjustmentAdjustable minimum and maximum output
Thermal managementIntegrated heat sink; fan configuration depends on the selected assembly
Status indicationPower, control input, output and fuse status; indicators depend on configuration
Fuse protectionBuilt-in fast fuse on applicable versions; confirm the selected current model
Over-temperature protectionH-Power version; catalogue threshold: heat sink above 75 °C
Operating environmentAmbient below 45 °C · Relative humidity below 90% RH
05 / DIMENSIONS & REFERENCE
Dimensions by model.
Find the overall housing size and mounting dimensions for each current rating.
| Model | Overall W × L × H | Mounting W × L |
|---|---|---|
| MGR-SCR-40LA-H | 112 × 165 × 155 | 101 × 95 |
| MGR-SCR-60LA-H | 112 × 165 × 155 | 101 × 95 |
| MGR-SCR-80LA-H | 112 × 165 × 155 | 101 × 95 |
| MGR-SCR-100LA-H | 112 × 213 × 155 | 101 × 95 |
| MGR-SCR-120LA-H | 112 × 213 × 155 | 101 × 95 |
| MGR-SCR-300LA-H | 150 × 255 × 200 | 135 × 150 |
W = width · L = length · H = height. Dimensions follow the current-specific MGR product sheets.
The reference illustration is schematic. For 300 A terminal connections, use the 300 A product sheet linked above.
06 / WIRING & OPERATION
Connect and control.
Main-circuit inputR / S / T
Load outputU / V / W
External control0–5 V DC, 0–10 V DC or 4–20 mA, according to the selected version
Output settingMinimum / maximum adjustment shown in the catalogue connection diagram
Supply and load connection
Follow the connection diagram supplied with the unit. The SCR-LAH installation notes specify a three-wire main circuit and a star load with no neutral connection; the general parameter table lists four-wire supply. Confirm the required supply arrangement for your model before connection.
Fuse replacement
For a unit fitted with fast fuses, replace a blown fuse with the same specified type and rating after correcting the fault.
Keep cooling paths clear
Allow ventilation around the heat sink and fan. Tighten power terminals securely and match cooling to the operating load.
High-power temperature protection
The catalogue describes shutdown above a heat-sink temperature of 75 °C on the protected H-Power version.
APPLICATION / HOW IT WORKS
See the switching function.
The command signal changes the conduction angle within each AC cycle, adjusting heater power. Input signal options depend on the ordered version. This animation illustrates the principle, not a measured waveform or signal calibration.
