Model 331 Brushless Slip Ring

Conductors: 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

Advantages:

  • Durable, compact, and low cost
  • Use for signal and/or power connections
  • Easy to install and replace
  • IP 51 protection rating with boot kit
  • Lightweight with robust metal construction
  • Long-lasting, energy efficient, and no maintenance
  • Made in the USA

PDF Spec Sheet CAD Download

Mercotac 331

Model 331 Product Specifications

331 Dimensions Diagram
    Details:
  • Disconnects are included
  • 55110 Small Straight Disconnect (Qty. 4)
  • 55250 Large Straight Disconnect (Qty. 1)
  • 55251 Large Flag Disconnect (Qty. 1)
  • Available with stainless steel ball bearing (331-SS) (recommended for wet or corrosive environments).
  • Dust/Splash Boot Kit available.

Model No. Terminals Body Material Bearing Type Max. Rotational Torque
(gf-cm)
Max. Voltage Rating
(AC/DC)
Max. Current Rating
(Amps)
Max. Rotational Speed
(RPM)
Operating Temp.
Min °F (°C)
Max °F (°C)
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)

Description: Boot Kit Parts
Item #: 57230

  • Vinyl Boot Kit for dust and splash protection
  • IP51 protection rating
Mercotac Bootkit 1

Description: Boot Kit Shown Assembled
Item #: 57230

  • Vinyl Boot Kit for dust and splash protection
  • IP51 protection rating
Mercotac Bootkit 2

Description: Large Flag Disconnect, Insulated
Item #: 55251

  • 16 AWG - 14 AWG
  • Qty. 1 included
  • Maximum recommended Amps: 15
Mercotac Bootkit 2

Description: Large Straight Disconnect, Insulated
Item #: 55250

  • 16 AWG - 14 AWG
  • Qty.1 included
  • Maximum recommended Amps: 15
Mercotac Bootkit 2

Description: Small Straight Disconnect, Insulated
Item #: 55110

  • 22 AWG - 18 AWG
  • Qty. 4 included
  • Maximum recommended Amps: 4
Mercotac Bootkit 2

Description: 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 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

Body Mount


Bushing Mount

Bushing Mount


Horizonal Mount to Body

Top Mount with Conductive Shaft

Good mounting method
(but vertical orientation is better)

Adaptor Mount to Body

Bottom Mount with Conductive Shaft

Use when the shaft diameter is smaller
than the body of the Mercotac.

Horizonal Mount to Bushing

Horizonal Mount with Conductive Shaft

Used if the shaft
cannot be fitted to the body diameter.

Thermal Insulated Mount to Bushing

Top Body 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

Horizonal Mount with Conductive Shaft

Best mounting method.

Bottom Mount to Bushing

Top Body Mount to Bushing

Floating Torque Arm Mount to Body

Horizonal Mount with Conductive Shaft

Protective Housing Mount to Body

Top Body Mount to Bushing

Recommended for wash-down or dirty environments.
Also recommended for food processing applications.

Vibration Isolation Mount to Body

Horizonal Mount with Conductive Shaft

With flexible bellows.

Vibration Isolating Mount to Body

Top Body Mount to Bushing

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.

Model 331 Standard Wire Connections

Mercotac 331 wiring

1. Wire connections, mounted inside rotating shaft.

2. Stationary end showing standard wire connections.

3. Wires crimp to terminals.
(Suggested tool: Thomas & Betts #WT 112M)





Model 331 Wire Connections with Optional Boot Kit



Mercotac 331 wiring

Wire connections, mounted inside rotating shaft.

Stationary end showing optional boot kit.

Mercotac 331 Wiring with Boot Kit

Cutaway view.

Mercotac 331 Wiring with Boot Kit

Wire connections, mounted inside rotating shaft.

Stationary end showing optional boot kit.

331

The Mercotac model 331 brushless slip rings are used in food packaging, ultrasonic welding, bearings manufacturing, and wireline trucks in the oil industry. They enable seamless power, control signal, and data transmission, ensuring efficient operations.

  • In food packaging, the slip rings transfer power and signals between stationary control systems and rotating components. They ensure precise and efficient packaging processes.
  • In ultrasonic welding, the slip rings facilitate power and signal transfer between stationary equipment and rotating welding tools, ensuring high-quality welding in automotive, electronics, and medical industries.
  • In bearings manufacturing, the slip rings enable efficient power and signal transmission, contributing to the production of high-quality bearings for various applications.
  • Wireline trucks in the oil industry rely on the slip rings for power and data transmission during well logging and intervention operations, ensuring efficient and accurate processes.

Overall, the Mercotac model 331 slip rings offer versatile solutions in multiple industries, enabling seamless power and signal transmission for enhanced operational efficiency.

Check out our Applications page for more examples of how Mercotac products are utilized.

Learning Center

Guidance for using Mercotac® Brushless Slip Rings in engineering designs.

Learning Center Construction & Materials

Learn about our Mercotac® Construction & Materials: Body Materials, Bearing Types, Conductors/Terminals, Thread Sizes, Mounting Options.
Learn More

Learning Center Electrical Characteristics

Learn about Mercotac® Electrical Characteristics: Voltage Rating, Current Rating, Contact Resistance, Circuit Separation, Operating Temperature, Frequency.
Learn More

Learning Center Rotational Characteristics

Learn about Mercotac® Rotational Characteristics: Rotational Speed, Rotational Torque.
Learn More