SB 50 Connector: Features, Applications and Selection Guide

Power distribution systems need connectors that can handle current reliably while allowing practical installation and maintenance. The SB 50 connector is designed for applications that require a compact, two-pole power connection with dependable mechanical retention.

The SB 50 family supports wire, PCB and busbar contact options. Its design also allows the same connector housing to mate with another housing of the same type. This genderless configuration can simplify cable assembly and field connection.

For engineers, OEMs and procurement teams, understanding the connector’s current rating, voltage capability, wire compatibility and operating conditions helps ensure the right selection for each application.

What Is an SB 50 Connector ?

The SB 50 connector belongs to the SB family of two-pole power connectors. The housing uses a one-piece construction with stainless-steel springs that retain the contacts.

The connector supports wire contacts across a range of wire sizes. The documented range extends from 16 AWG to 6 AWG, or approximately 1.3 mm² to 13.3 mm², depending on the contact configuration.

The connector can also support PCB and busbar contacts. This gives designers more flexibility when developing power distribution systems.

Another important feature is its genderless design. Identical housings can mate with each other. Mechanical keying also helps prevent incompatible colour-coded housings from mating.

Key Specifications of SB 50 Connectors

Technical specifications should always guide connector selection. The manufacturer’s published data provides several important parameters for the SB 50 family.

The wire-contact configuration supports current ratings up to 120 A under specific UL-rated conditions. The connector also carries a 600 V AC/DC UL voltage rating under the specified conditions.

The IEC information lists a 50 A AC/DC rating and a 250 V steady-state AC/DC voltage rating for the applicable configuration.

The standard operating temperature range is -20°C to 105°C.

The connector also has a dielectric withstand voltage of 2,200 V AC according to the published specification.

These figures apply to defined configurations and test conditions. Engineers should therefore check the applicable datasheet before finalising a design.

Why Choose a 50A Power Connector for DC Applications?

A 50A power connector can suit systems where designers need a reliable connection for moderate-current DC power distribution.

Current capacity alone does not determine connector suitability. Engineers must also consider wire size, ambient temperature, contact configuration, duty cycle and installation conditions.

The SB 50 design offers several practical advantages:

• Two-pole power connection
• Genderless mating configuration
• Multiple contact options
• Wire sizes ranging from 16 AWG to 6 AWG for applicable contacts
• Compact housing design
• Options for wire, PCB and busbar connections
• Mechanical keying through colour-coded housings
• Support for repeated mating and unmating

These characteristics make the connector useful in systems that require accessible and serviceable power connections.

SB 50 Connectors and Contact Configuration

The contact forms available for the SB 50 housing allow the connector to support different system architectures.

Wire contacts provide a conventional cable-to-cable connection. PCB contacts allow integration with circuit boards. Busbar contacts provide another option for power distribution assemblies.

Contact plating also affects electrical performance and application suitability. Published specifications include silver- and tin-plated copper contact options.

The correct contact must match the selected wire size and the electrical requirements of the application.

Using the correct contact also helps maintain the intended electrical and mechanical performance of the completed connector assembly.

Applications of the SB 50 Connector

The SB 50 connector is commonly associated with battery and DC power distribution applications.

Battery systems often require connectors that allow quick connection and disconnection during installation or servicing. A two-pole power connector can simplify this type of architecture.

Potential application areas include:

Battery Power Systems

Battery packs and power distribution assemblies can require detachable high-current connections. The SB 50 family provides a practical two-pole interface for suitable battery applications.

Industrial Equipment

Industrial equipment often includes replaceable power modules, batteries or auxiliary power connections. A serviceable connector can make maintenance easier.

Portable Power Equipment

Portable power systems benefit from connectors that provide secure mating while allowing users to disconnect the power source when required.

DC Power Distribution

The connector can also support DC power distribution designs where the electrical and mechanical requirements fall within its specified ratings.

The final connector selection should always consider the complete electrical load and operating environment.

What Should You Check Before Selecting an SB 50 Connector ?

Choosing the right connector requires more than checking the nominal current rating.

1. Current Requirement

Start with the maximum continuous and peak current of the application.

Do not select a connector solely because its headline current rating appears suitable. Review the applicable contact, wire size and test conditions.

2. Voltage Requirement

Check the system’s operating voltage against the connector’s applicable voltage rating.

The published specifications include a 600 V AC/DC UL rating under defined conditions. IEC ratings may differ depending on the configuration and application.

3. Wire Size

Match the contact to the cable size.

The SB 50 family supports wire-contact configurations from 16 AWG to 6 AWG. The exact range depends on the selected contact.

4. Operating Temperature

Consider both ambient temperature and heat generated by current flow.

The standard published operating range extends from -20°C to 105°C. A chemical-resistant housing option can provide a wider low-temperature range in applicable configurations.

5. Connection Frequency

Consider how often the connector will be mated and unmated.

Published specifications list mating-cycle performance for wire and PCB contacts. The actual cycle rating depends on the contact plating and configuration.

Installation Considerations

Correct assembly plays an important role in connector performance.

First, select the correct contact for the wire size. Then use the appropriate termination method and tooling specified for that contact.

The contact must sit correctly inside the housing. A poorly terminated contact can increase electrical resistance and create unwanted heat.

Cable routing also matters. Avoid excessive pulling, bending or mechanical stress at the connector.

Before energising the system, inspect the completed assembly. Check the housing, contacts and cable termination for visible damage or incorrect assembly.

Engineers should also follow the manufacturer’s assembly instructions for the specific connector and contact combination.

Frequently Asked Questions

What is an SB 50 connector used for?

The SB 50 connector is used for two-pole power connections in applications such as battery systems and DC power distribution. Its suitability depends on the electrical and mechanical requirements of the specific application.

What current can an SB 50 connector handle?

The published specifications list different current ratings depending on the configuration and applicable standard. Wire-to-wire configurations can have UL-rated current capability up to 120 A under specified conditions, while IEC information lists a 50 A rating for the applicable configuration.

What wire sizes work with SB 50 connectors?

Applicable wire contacts support sizes from 16 AWG to 6 AWG, corresponding approximately to 1.3 mm² to 13.3 mm². The exact wire range depends on the selected contact.

Is the SB 50 connector genderless?

Yes. The SB 50 housing uses a genderless design. A connector housing can mate with another compatible housing of the same type.

What voltage is an SB 50 connector rated for?

The published UL specification lists 600 V AC/DC under defined conditions. Other ratings can vary by configuration and applicable standard, so engineers should consult the relevant datasheet.

Can SB 50 connectors support PCB connections?

Yes. The SB 50 family includes PCB contact options in addition to wire and busbar contacts.

What is the operating temperature range?

The standard published operating range is -20°C to 105°C. Certain chemical-resistant configurations can extend the lower temperature limit to -40°C.

Why Source SB 50 Connectors from OX Connections?

For OEMs and procurement teams, connector selection is only one part of the sourcing process. Consistent availability, technical support and product range also influence project timelines.

OXConnections supplies industrial-grade electronic and power connectors for OEM and manufacturing requirements. Its connector portfolio includes SB series, EV and lithium battery connectors, solar connectors, new energy storage connectors and other power-connection solutions.

OX Connections also maintains a broad connector portfolio and provides technical support to help customers identify suitable components for their applications.

For businesses sourcing SB 50 connectors for battery systems, DC power distribution or industrial equipment, OX Connections can support the requirement with its power connector portfolio and application-focused sourcing approach.

The right connector starts with the right technical specification. It also depends on dependable sourcing. OX Connections brings these requirements together for OEMs, manufacturers and industrial users looking for reliable power connectivity solutions.