moflon slip rings
MMC397 Slip Rings

OD 15.50mm(0.59"),Length 39.7mm(1.56")

MMC397 slip rings are small and compact with OD 15.5mm * L 39.7mm, standard, off-the-shelf.Color-coded lead wires are used on both the stator and rotor for simplified electrical connections. Using a 90° V-groove ring design for each ring.

MMC3979 is the high-end version corresponding to MMC397, It has higher performace and longer working life, higher speed rotating speed,low noise, Pealse refer to table 2 as below.

part # OD * L signal/2A 4A 8A 15A Total wires download
MMC397-S2415.5mm*39.7mm2400024PDF CAD
MMC397-P021515.5mm*39.7mm00022PDF CAD
Shared Specifications
Wires24/2(see table as above)CurrentSignal(2A)/15A
Voltage240 VDC/VACMax speed150RPM
Overall diameter15.5mm(0.59")Length39.7mm(1.56")
Contact MaterialPrecious Metal:gold-goldContact Resistance<150mOhm(AWG28#,250mm)
Housing MaterialPlasticsTorque0.06N.m
Working lifedepends on working speedElectrical noise<10mΩ
Dielectric strength600VDC@50HzLead WireUL Teflon® Awg30
Insulation resistance1000MΩ@500VDCLead Lengths250mm
Operating Temp.-40°C to 80°CProtectionIP51
Mechanical vibratioMIL-SID-810EHumidity10% to 90% RH
MaterialsLead Free,RoHS compliantCE CertifiedYES

1)The operational life of the unit is dependent upon rotational speed, environment and temperature.
2)Lead Wire size: 2A/signal -> AWG30, 15A -> AWG16 colored code.
3)Electrical noise is dependent upon the rotating speed and current,voltage.


Max SpeedWorking lifeTorque Housing
Electrical noise①
MMC397150RPMdepends on working speed0.06 N·mPlastics10mΩ
MMC3979600RPM1depends on working speed0.01 N·mMetal4mΩ