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ORIGINALS

B - Indoor keyed

LEMO original Push-Pull solution for protected environments
B - Indoor keyed
Push-Pull self latching system
8 sizes
up to 64 contacts
Multi-Keying system
Indoor/protected environments (IP50)
Main Features
Push-Pull self latching system
8 sizes
up to 64 contacts
Multi-Keying system
Indoor/protected environments (IP50)
Reliable High quality and performance interconnect solutions
Modular and custom made complete solutions
Worldwide presence with local experts, stock management and cable assembly everywhere

Form & Material

Environment
Broad metallic high quality circular connector range for indoor/protected environments (IP50)
Latching system
Push-Pull latching system enabling simple/quick yet safe and reliable frequent connect and disconnect
Keying system
Keying system allowing for a high contact density, with multiple key options to prevent mismating
Construction
Field proven solid & compact construction
Ergonomy
Ergonomic design thanks to patented chocolate pattern
Size and model
Various sizes and models including elbow plugs, miniature models, watertight and vaccumtight receptacles

Electrical configurations

Insert configurations
Large selection of insert configurations including high-density low voltage, high power voltage, high-speed coaxial, fibre optic, fluidic and thermocouple contacts as well as hybrid solutions
Screening
360° screening for full EMC shielding
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Solutions Selection Guide
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B, K & T Series Catalog
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Unipole Multipole General Catalog
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Product brief - High-speed data transfer
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Product brief - USB 3.1
Other documents
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Suitable applications
Audio Video
audio video
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Energy & Industrial
energy industrial
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Specialities & Other
specialities other
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Semiconductor
semiconductor
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Medical
medical
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Motorsport
motorsport
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Test & Measurement
test-measurement visuel
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Security & Defence
security defense
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Transportation, Aerospace & UAV
transportation aerospace UAV
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ORIGINALS
Use the table to compare the 5 main series within the “ORIGINALS” connector family and to identify the connector(s) best adapted to your specific requirements.
B - Indoor keyed

B - Indoor keyed

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K - Outdoor keyed

K - Outdoor keyed

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T - Small Outdoor keyed

T - Small Outdoor keyed

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S - Indoor Stepped Insert

S - Indoor Stepped Insert

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E - Outdoor Stepped Insert

E - Outdoor Stepped Insert

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Description Description LEMO original Push-Pull solution for protected environments Description LEMO original Push-Pull solution for outdoor environments Description LEMO original miniature Push-Pull solution for outdoor environments Description LEMO original Push-Pull solution with unmatched mating ergonomy Description LEMO original Push-Pull solution for outdoor environments with unmatched mating ergonomy
Locking Locking Push-Pull Locking Push-Pull Locking Push-Pull Locking Push-Pull Locking Push-Pull
Size Size 8 sizes from ø 6.4 to ø 35.0 mm (plugs) Size 6 sizes from ø 11.0 to ø 38.0 mm (plugs) Size 5 sizes from ø 7.0 to ø 18.8 mm (plugs) Size 8 sizes from ø 6.4 to ø 46.0 mm (plugs) Size 7 sizes from ø 11.0 to ø 47.0 mm (plugs)
Keying Keying 13 keyway options Keying 9 keyway options Keying 5 keyway options Keying 1 (stepped inserts) Keying 1 (stepped inserts)
Shell Types Shell Types Over 60 shell styles​ Shell Types Over 28 shell styles​ Shell Types Over 14 shell styles Shell Types Over 50 shell styles​ Shell Types Over 22 shell styles​
Shell Material Shell Material Brass Shell Material Brass Shell Material Brass Shell Material Brass Shell Material Brass
Plating Plating Chrome Plating Chrome Plating Chrome Plating Chrome Plating Chrome
Cable Diameter Cable Diameter 1.4 to 25 mm Cable Diameter 1.0 to 23.5 mm Cable Diameter 2.4 to 15 mm Cable Diameter 1.3 to 30 mm Cable Diameter 1.0 to 30 mm
NB of contact NB of contact 2 to 64 NB of contact 2 to 64 NB of contact 2 to 32 NB of contact 1 to 106 NB of contact 1 to 106
AWG AWG 8 to 32 AWG 8 to 32 AWG 12 to 32 AWG 0 to 32 AWG 0 to 32
Contact types Contact types Multipole • Coax • Fibre Optic • Fluidic High Voltage • Mixed • Thermocouple Contact types Multipole • Coax • Fibre Optic • Fluidic High Voltage • Mixed • Thermocouple Contact types Multipole • Coax • Fibre Optic • Fluidic High Voltage • Mixed • Thermocouple Contact types Unipole • Multipole • Coax • Fibre Optic • Fluidic • Mixed • Thermocouple Contact types Unipole • Multipole • Coax • Fibre Optic Fluidic • Mixed • Thermocouple
Contact Termination Contact Termination Solder / Crimp / Print (PCB) Contact Termination Solder / Crimp / Print (PCB) Contact Termination Solder / Crimp / Print (PCB) Contact Termination Solder / Crimp / Print (PCB) Contact Termination Solder / Crimp / Print (PCB)
Data Protocols Data Protocols USB 2.0 / USB 3.1 / Eth Cat6a Data Protocols USB 2.0 / USB 3.1 / Eth Cat6a Data Protocols USB 2.0 / USB 3.1 / Eth Cat6a Data Protocols - Data Protocols -
Sealing Level Sealing Level IP50 / hermetic sockets Sealing Level IP68 / hermetic sockets Sealing Level IP68 / hermetic sockets Sealing Level IP50 / hermetic sockets Sealing Level IP68 / hermetic sockets
Temperature Range Temperature Range -55°C to 250°C Temperature Range -55°C to 200°C Temperature Range -55°C to 200°C Temperature Range -55°C to 250°C Temperature Range -55°C to 200°C
Mating Cycles Mating Cycles > 5000 Mating Cycles > 5000 Mating Cycles > 3000 Mating Cycles > 5000 Mating Cycles > 5000
B - Indoor keyed

The B series is LEMO’s iconic, modular range of connectors for test and measurement, instrumentation, medical devices, research, and audio/video applications which require quick and secure Push-Pull latching for use indoors and in protected environments (IP50).   The B Series comprises a large selection of sizes and models and a wide assortment of insert configurations, including high-density low voltage and hybrid configurations with fluidic, coaxial, fibre optic, high voltage and thermocouple contacts.

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B series connectors by LEMO : the trusted choice for the most versatile applications.

The LEMO B series is more than just a connector; it is the industry standard and the original Push-Pull solution that has set the benchmark for performance and reliability for decades. Rooted in Swiss engineering, these connectors are the trusted choice for engineers and designers who require a secure and durable electrical interface and signal integrity for their most critical systems. When your application demands precision and absolute dependability, the B series delivers consistent, high-quality performance.

Key features and technical specifications

The longevity and widespread adoption of the B series are a direct result of its superior design and versatile specification. We have engineered this range to offer a comprehensive selection of options, ensuring you can find the perfect configuration for any application without compromising on quality or performance. The modular design provides an exceptional choice of sizes, contact types, and keying options to prevent mis-mating.

The original push-pull self-latching system

At the heart of the B series is the iconic and highly reliable push-pull self-latching mechanism. This system was pioneered by LEMO and remains a cornerstone of modern connector design. The connector securely latches once plugged in, making it impossible to disconnect by pulling on the cable. This provides an immense level of safety and security, especially in environments with high vibration or potential for accidental cable snags. To disengage, you simply pull on the outer release collar for a smooth and easy disconnection. This intuitive operation makes the original Push-Pull connector ideal for applications where quick and frequent mating is required.

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  • Multiple keying options: A comprehensive keying system (G, A, B, C, etc.) ensures operator safety and prevents accidental cross-mating between adjacent connectors.
  • Wide range of shell sizes: Available in 8 sizes from 00 to 5B, offering a compact solution for any space constraint.
  • Extensive contact configurations: Options for solder, crimp, or print circuit board (PCB) contacts, with multipole layouts from 2 to 64 contacts.
  • 360° EMC shielding: Providing excellent electromagnetic compatibility and signal integrity for sensitive applications.
  • High durability: Engineered for over 5,000 mating cycles, guaranteeing a long service life even in high-use applications.

Proven applications in critical industries

The versatility and robustness of the LEMO B series have made it a preferred component across a wide spectrum of demanding industries. Engineers trust its performance in environments where system failure could have serious consequences, from medical emergencies to live international broadcast events.

Trusted in medical, defence, and aerospace sectors

In the medical industry , the B series is used in life-saving equipment such as patient monitoring systems and surgical instruments, where its high durability and reliability are essential. For defence and aerospace applications , its ability to withstand extreme shock, vibration, and temperature fluctuations ensures uninterrupted performance for critical communication and control systems. The secure locking mechanism is vital for maintaining a stable electrical connection in these harsh environments.

Precision for test & measurement and broadcast

For test and measurement applications , signal integrity is paramount. The B series guarantees accurate and repeatable measurements thanks to its high-quality contacts and effective shielding. In the broadcast industry, these connectors are a familiar sight on cameras, audio equipment, and control panels, prized for their robustness and ability to withstand the rigours of field production and ensure flawless transmission.

Configure and source your B series connector

Finding the exact connector for your specification is straightforward. We offer powerful online tools: Product Finder and dedicated support to help you select, configure, and source the ideal solution for your project, whether you need a single component or a fully customised cable assembly.

Find the right connector with our product selector

Our online product selector is designed to help you efficiently navigate our extensive B series portfolio. You can filter the range by key specifications such as series, shell type, number of contacts, and termination type to quickly identify the precise part number that meets your requirements. This tool streamlines the selection process, saving you valuable engineering time.

Request a quotation or custom cable assembly

Once you have identified your required connector, you can request a quotation directly. However, our expertise extends beyond the connector itself. If your application requires a complete, pre-terminated solution, our teams can design and build a custom cable assembly to your exact specifications. This service ensures optimal performance and compatibility, simplifying your installation and maintenance processes. Explore our full range of LEMO connectors or contact our team today to discuss your project's specific needs.