1Speed Control Knob: This knob can adjust motor speed, easy to use 2Clear operation panel and dial, the pointer can point speed accurately 3When the load is fan or pump, the power saving effect is remarkable 4With IP5X dustproof class, can be used for panel embedded or wall mounted, bottom incoming wire 5Used for speed control of electromagnetic asynchronous motor (slip motor), realizing stepless adjustment of constant torsionFeatures:Speed Control Knob: This knob can adjust motor speed, easy to use. Clear operation panel and dial, the pointer can point speed accurately. When the load is fan or pump, the power saving effect is remarkable. With IP5X dustproof class, can be used for panel embedded or wall mounted, bottom incoming wire. Used for speed control of electromagnetic asynchronous motor (slip motor), realizing stepless adjustment of constant torsion. Specification:Input Speed: 1rpmOutput Speed Range: 1Exciting Voltage: DC90VField Current: 5AMounting-hole Size: Approx. 192 x 132mm / 7.6 x 5.2inchProduct Size: Approx. 210 x 150mm / 8.3 x 5.9inchWeight: Approx. 944g / 33.3ozOptional Model JD1A-11 JD1A-40 JD1A-90 Speed Adjustable Range 125-1250RPM 132-1320RPM 440-1320RPM Control Motor Power 0.55-11kW 15-40kW 45-90kW Max Output DC 90V 3A DC 90V 5A DC 90 8V Speed Variation Rate 3% Steady Speed Precision 1% Input Voltage AC 200-240V Package List: 1 x Electromagnetic Motor Speed Controller 1set x Accessory