Model 330
Brushless Slip Ring
Three Conductor,
Amps: 3@30
Volts: 250
The Mercotac® model 330 brushless slip rings are an excellent solution for a variety of applications. One example is in crane booms, where they enable the continuous transmission of power, control signals, and data between the base and rotating boom. These units can also support components like lights, sensors, and cameras, as well as extension, retraction, and rotation functions.
Model 330 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) |
| 330 | 3 | Anodized Aluminum | Chrome Steel | 300 | 250 | 30 | 1200 | Min -20 (-29) Max 140 (60) |
100 | <1 | >25 |
| 330-SS | Stainless Steel |
- “SS” designator indicates stainless steel ball bearing (recommended for wet or corrosive environments)
Model 330 Accessories
57430
Boot Kit Parts
57430
Boot Kit Assembled
55251
Large Flag Disconnect, Insulated
55252
Large Straight Disconnect, Non-Insulated
55253
Shrink Tube
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 330 Connections
Model 330 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 330 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 330 Suggested Mounting Methods
Model 330 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 .
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.