Secure power terminals
Tighten A1, B1, C1 and A2, B2, C2 securely. Loose high-current connections can overheat and damage the SCR.
← All power regulatorsMGR-SCR3
THREE-PHASE / SCR POWER REGULATOR
MGR-SCR3
Series
Compact three-phase SCR regulator modules for cabinet integration and external heat-sink installation. Choose a model by its rated current, installation conditions and control requirements.
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01 / MODEL RANGE
Seven current options.
The current values below identify the available model designations; confirm the exact rated-current interpretation and thermal conditions against the datasheet for your selected model.
SCR3-25LEMODEL25A
SCR3-40EGMODEL40A
SCR3-60EGMODEL60A
SCR3-75LEMODEL75A
SCR3-80EGMODEL80A
SCR3-100EGMODEL100A
SCR3-120EGMODEL120A
02 / PRODUCT VIEWS
See the SCR3-40EG from every side.
White-background photographs of the SCR3-40EG, including its front, mounting base, enclosure sides and terminal connections.
03 / PARAMETERS
Electrical reference.
Catalogue specifications for the basic MGR-SCR3_LA series are shown below. The exact suffix and configuration should be checked against the current datasheet for the selected unit.
Product familyMGR-SCR3_LA · Basic three-phase phase-control regulator
Output stageThree sets of anti-parallel power SCRs
Control signal optionsE: 0–5 V · F: 0–10 V · G: 4–20 mA
Main-circuit supplyThree-phase 380 VAC, four-wire (catalogue reference)
Cooling-fan supply220 VAC when the air-cooled fan is installed
Frequency50 / 60 Hz
Output modePhase-angle control / phase output
Available rated current models25 A · 40 A · 60 A · 75 A · 80 A · 100 A · 120 A
Operating environmentAmbient temperature below 45 °C; relative humidity below 90% RH
Cooling configurationHeat sink and air-cooled fan are optional for the basic type; confirm the supplied configuration
ProtectionBasic type has no built-in fast fuse or over-temperature protection in the catalogue description
Phase sequenceNo phase-sequence requirement (catalogue reference)
04 / DIMENSIONS & WIRING
Plan the panel and connections.
The catalogue reference drawing shows the basic SCR3_LA with heat sink and air-cooled fan. It lists overall dimensions of 100 × 110 × 145 mm and mounting dimensions of 90 × 80 mm. Confirm that this assembly drawing matches the exact SCR3-40EG configuration before using it for panel cut-outs.
Overall assembly (W × L × H)100 × 110 × 145 mm
Mounting pattern (W × L)90 × 80 mm
Main circuitThree-phase, four-wire input · A1 / B1 / C1 input · A2 / B2 / C2 output
05 / INSTALLATION
Install and cool correctly.
Check star-connected loads
For a Y-connected load, connect the load neutral to the supply neutral. If the neutral is not connected, the three-phase load should be relatively balanced.
Provide thermal management
For loads above 15 kW, the catalogue recommends a suitable heat sink, thermal grease between the heat sink and SCR backplate, and forced-air cooling; it specifically calls for a high-power air-cooled fan above this level.
Add semiconductor fuse protection
The basic type does not include a fast fuse by default. The catalogue recommends a semiconductor high-speed fuse to protect the load and module from overcurrent.
Reference information is based on the MGR English catalogue. Confirm model suffix, control input, supplied cooling parts, wiring and dimensions for the exact unit before installation.