Model 331
Brushless Slip Ring
Three Conductor,
Amps: 2@4 Amps, 1@30 Amp
Volts: 250
The Mercotac® model 331 brushless slip rings are an excellent choice for food packaging such as rotary indexers or filling systems as they enable the continuous transfer of power, control signals, or data signals between the stationary control system and the rotating components of the machine
Model 331 Specifications
| Model Number | No. of Conductors | Body Material | Bearing Type | Max. Rotational Torque (gf-cm) |
Max. Voltage Rating (AC/DC) |
Max. Current Rating (Amps) |
Max. Rotational Speed (RPM) |
Operating Temperature °F (°C) max./ °F (°C) min. |
Max. Frequency (MHz) | Contact Resistance (mΩ) |
Circuit Separation (MΩ) |
| 331 | 3 | Anodized Aluminum | Chrome Steel | 200 | 250 |
2@4 & 1@30 |
1800 | Min -20 (-29) Max 140 (60) |
100 | <1 | >25 |
| 331-SS | Stainless Steel |
- “SS” designator indicates stainless steel ball bearing (recommended for wet or corrosive environments)
Model 331 Accessories
57230
Boot Kit Parts
57230
Boot Kit Assembled
55251
Large Flag Disconnect, Insulated
55250
Small Straight Disconnect, Insulated
55110
Small Straight Disconnect, Insulated
Other Disconnects
Disconnects for other wire gauges are available and can be substituted for the standard disconnects(22-18 AWG and 12-10 AWG). See Ampacity Table
Model 331 Connections
Model 230 Standard Wire Connections
- Wire connections, mounted inside rotating shaft.
- Stationary end showing standard wire connections.
- Wires crimp to terminals. (Suggested tool: Thomas & Betts #WT 112M)
Model 331 Wire Connections with Optional Boot Kit
Wire connections, mounted inside rotating shaft.
Stationary end showing optional boot kit.
Cutaway view.
Wire connections, mounted inside rotating shaft.
Stationary end showing optional boot kit.
Model 331 Suggested Mounting Methods
Model 331 is typically mounted by either the black body or the white plastic bushing on either end using a set screw or split clamp. When used horizontally, mount the Mercotac so the body of the connector rotates
Body mount
Brushing mount
Horizonal Mount to Body
Good mounting method (but vertical orientation is better)
Adaptor Mount to Body
Use when the shaft diameter is smaller than the body of the Mercotac.
Horizonal Mount to Bushing
Used if the shaft cannot be fitted to the body diameter.
Thermal Insulated Mount to Bushing
May be needed if thermal insulation is necessary. Used if the shaft cannot be fitted to the body diameter
Top Mount to Body
Best mounting method.
Bottom Mount to Bushing
Floating Torque Arm Mount to Body
Protective Housing Mount to Body
Recommended for wash-down or dirty environments. Also recommended for food processing applications.
Vibration Isolation Mount to Body
With flexible bellows.
Vibration Isolating Mount to Body
With floating drive coupling.
Installation Notes:
- The up arrow should not point below horizontal.
- Do not solder to or bend terminals.
- Avoid lateral forces and mechanical loads (overly stiff or tight wires).
- Do not rigid mount both ends of the Mercotac.
- Limit the mounting eccentricity (runout / wobble) to .005″ (.13mm).
- Provide overload protection within the circuit.
- Avoid vibration and bumping motions.