Sentric Safety Group

What Sentric Safety Group does

Sentric Safety Group is a London-based holding company that unites five heritage industrial safety brands — Castell (founded 1922), Kirk (1932), STI/Serv Trayvou (130+ years of history), Salvo (2005), and Zonegreen (acquired March 2023) — under a single platform serving enterprise customers in energy, industrial, logistics/loading bay, and railway verticals. The company's core technology is Trapped Key Interlocking (TKI), a mechanical and electromechanical safety architecture that physically enforces predetermined operating sequences, preventing unsafe actions in electrical isolation, machine guarding, and vehicle movement contexts. Zonegreen's Depot Personnel Protection System (DPPS) extends this approach into rail depot environments using Network Rail-approved powered derailers, RFID-controlled road end panels, and Depot Manager SCADA software for personnel and asset tracking. Additional offerings include the Points Converter System (automating manual rail points requiring up to 103kg of force), Salvo loading bay trailer restraint systems, and over 70,000 electromechanical safety components manufactured annually by Kirk.

Sentric operates a sales-led, consultative go-to-market model with brand-specific sales teams (Castell, Kirk, Salvo, STI, Zonegreen) targeting enterprise and industrial customers via direct field sales, inside sales, industry events (WindEurope, InnoTrans, Railtex), and rail contractor channel partners. Revenue derives from one-time hardware sales, ongoing spare parts and accessories, biannual planned preventative maintenance contracts, and custom engineering services. Pricing is quote-based with multi-year contracts, credit facilities for established customers, and regional trading company distribution networks. The company holds ISO 9001/14001/45001 certifications, SIL 2 safety integrity certification for DPPS, and independent EMC compliance — collectively forming substantial regulatory moats. Sentric has been a wholly-owned subsidiary of Halma plc, a FTSE 50 group of life-saving technology companies, since 1962, providing institutional capital and cross-portfolio distribution leverage across operations in the UK, USA, France, China, Tunisia, and customer markets spanning UK, Ireland, Australia, Germany, Czech Republic, Qatar, Dubai, and the USA.

Key customer relationships include DHL Czech Republic (19-bay loading bay deployment), a top US retailer (50 distribution centers), East Midlands Railway/Etches Park Depot, Nexus/Gosforth Metro, GTR/Selhurst, South Western Railway/Wimbledon, Northern Trains/Botanic Gardens, Qatar Rail/Doha Metro (three facilities), Siemens/Three Bridges, and a leading switchgear OEM and UK waste management provider — illustrating both enterprise deal size and vertical diversification.

Name

Sentric Safety Group

Legal name

Sentric Safety Group

Website

https://sentricsafetygroup.com

Company type

Private

Founded year

2022

Operating status

Operating

Headcount range

51–100 employees

Short description

Sentric Safety Group is a London-based holding company uniting five heritage industrial safety brands (Castell, Kirk, Salvo, STI, Zonegreen) that provide trapped key interlocking systems, rail depot personnel protection, and loading bay safety hardware to enterprise customers across energy, industrial, logistics, and railway sectors globally as a wholly-owned subsidiary of Halma plc.

Ownership category

akta.pro rank

Product category

Industrial Safety Equipment

NAICS

Relay and Industrial Control Manufacturing (335314), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451), Switchgear and Switchboard Apparatus Manufacturing (335313), Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance (811310)

SIC

Electrical Industrial Apparatus (3620), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Safety Instrumented Systems & Machine Safety Control (SIS, Safety PLCs, Relays) (IMAGABAF)

akta.pro secondary industries

Electrical, Instrumentation & Controls (E&I) Maintenance (IMAIACAE), Reliability, Safety & Risk Engineering (RAMS/PSM) Consulting (BPAHAIAK)

Keywords

• Trapped key interlocking systems
• Industrial safety interlocks
• Rail depot safety systems
• Loading bay safety equipment
• Mechanical safety components

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices6 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Safety Hardware Products: Sale of trapped key interlock systems, derailers, points converters, loading bay safety systems, and associated mechanical/electromechanical safety components. Products are sold under the Castell, Kirk, Salvo, Serv Trayvou (STI), and Zonegreen brands. Revenue is generated through direct sales to enterprise customers and via channel partners.
2. Spare Parts and Accessories: Ongoing sale of spare parts, replacement keys, and accessories for installed safety systems. Customers require spare parts for maintenance of existing installations.
3. Maintenance and Service Contracts: Biannual planned preventative maintenance (PPM) visits and ongoing service contracts for installed systems. Zonegreen conducts maintenance visits to ensure DPPS systems remain operational, including at their 50th UK depot customer (Hull Botanic Gardens).
4. Engineering and Custom Solutions: Custom design, engineering services, and tailored safety solutions for specific customer requirements, including multi-key enclosure systems, transition box systems, and integration with third-party equipment.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

Sentric Safety Group manufactures and distributes mechanical and electromechanical safety solutions — primarily trapped key interlocking systems, loading bay trailer restraints, and rail depot personnel protection systems — across energy, industrial, railway, and logistics sectors under the Castell, Kirk, Salvo, Serv Trayvou (STI), and Zonegreen brands. The portfolio includes safety hardware components, electronic depot protection systems, custom engineering solutions, spare parts, and ongoing maintenance and service contracts for enterprise customers operating in harsh, safety-critical environments.

Product overview

Sentric Safety Group is a unified portfolio of five leading safety solutions brands—Castell, Kirk, Salvo, STI (Serv Trayvou), and Zonegreen—offering hardware-based safety systems for harsh and safety-critical environments. The offering is a multi-brand platform approach rather than a single unified product, where each brand maintains its distinct identity and specialized focus: Castell and Kirk provide trapped key interlocks and isolation safety components; Salvo focuses on loading bay safety; STI/Serv Trayvou serves the French and European markets with trapped key interlocks; and Zonegreen delivers rail depot safety systems including the Depot Personnel Protection System (DPPS), Points Converter System, and associated Depot Manager SCADA software. The company provides comprehensive safety solutions across energy, industrial, logistics, and railway sectors, all unified under the Sentric Safety Group umbrella while maintaining individual brand identities.

Differentiator

Problem solved

Functional benefit

Brands

• Castell Safety: Trapped key interlocking solutions provider with over 100 years of experience, serving energy, industry, manufacturing, and transport sectors globally.
• Kirk Key Interlock
• Salvo Loading Bay Safety
• STI (Serv Trayvou)
• Zonegreen

Products and services

• Castell — Trapped Key Interlock Solutions Trapped key interlock safety solutions with over 100 years of heritage, protecting people and assets in energy, industrial, manufacturing, and transport sectors through mechanical and electromechanical interlocking that enforces safe operating sequences.
• Kirk — Safety Components & Isolation Interlocks Designs and manufactures over 70,000 safety components annually including mechanical isolation interlocks, electromechanical isolation interlocks, transfer panels, access interlocks, smart solutions, and engineering services for hazardous environments.
• Salvo — Loading Bay Safety System Loading bay safety system that safeguards against accidental drive-aways by physically interlocking the trailer's air brakes with the loading bay door using trapped key interlocking principles; protects personnel and optimises the flow of goods in manufacturing, retail, and warehouse facilities.
• STI (Serv Trayvou) — Trapped Key Interlock Systems Trapped key interlock systems supplied for over 130 years across railway, power generation, chemicals, petrochemicals, steel, and food industries, providing global safe environments through smart protection.
• Zonegreen — Rail Depot Safety Systems Rail depot safety technology developer offering the Depot Personnel Protection System (DPPS) and Points Converter System, protecting rail workers through remote-controlled and automated systems using interlocking with Network Rail approved powered derailers and RFID-controlled road end panels.
• Depot Personnel Protection System (DPPS) Safeguards rail depot staff and equipment from the risk of train vehicle movements and electrification using interlocking solutions with Network Rail approved derailers and RFID-controlled road end panels; certified to SIL 2 safety integrity level and EMC compliant.
• Points Converter System Automates and enables remote operation of manual hand points, switches, and railroad crossings, protecting workers from potential handling injuries (manual points can require up to 103kg of force).
• Salvo Loading Bay Safety System Safeguards against accidental drive-aways by physically interlocking the trailer with the bay, ensuring safety for personnel and optimising the flow of goods in loading bays; cold weather sleeve accessory available for harsh conditions.
• Maintenance and Service Contracts for DPPS Recurring maintenance and service contracts for installed rail depot safety systems, including biannual planned preventative maintenance visits that ensure continued operational compliance of DPPS at customer depots.
• Spare Parts and Accessories Spare parts, replacement keys, and accessories (including the Salvo Cold Weather Sleeve for loading bay gladhands) for installed safety systems across Castell, Kirk, Salvo, STI, and Zonegreen product lines.
• Engineering and Custom Safety Solutions Custom design, engineering services, and tailored safety solutions for specific customer requirements, including multi-key enclosure systems, transition box systems, and integration with third-party equipment across the group's safety brands.

Quantifiable outcome

• Depot safety systems reduce the risk of human error — the root cause of most depot accidents
• +4 more outcomes

Named customers15 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Ten partnerships are on record, tiered minor.

• WindEuropeminorOthers · 16 May 2023Sentric Group became a member of WindEurope, the leading association for the wind energy industry in Europe with over 450 member companies. Through membership, Sentric accesses resources and expertise in the wind energy industry and collaborates with other members to share ideas and best practices.
• Volker FitzpatrickminorImplementation/ SI/ Consulting PartnerMain contractor for the £70 million Gosforth Metro depot project. Worked with Zonegreen to implement DPPS at four roads in the main shed and the wheel lathe road at the 12-acre facility.
• SiemensminorStrategic or Co-development PartnerSiemens is the depot operator at Three Bridges facility near Crawley, UK. Zonegreen installed warning beacons integrated with DPPS to address growing maintenance work on sidings and stabling roads.
• Govia Thameslink Railway (GTR)minorStrategic or Co-development PartnerGTR is the UK's largest rail franchise. Zonegreen completed a third upgrade project at GTR's Selhurst depot (following Battersea Stewarts Lane and Brighton), installing DPPS on seven roads in the inspection shed.
• Kier TransportationminorImplementation/ SI/ Consulting PartnerContractor for the Etches Park depot expansion project. Zonegreen worked with Kier Transportation to equip a 170-metre single-ended road with DPPS as part of East Midlands Railway's upgrades.
• RTS InfrastructureminorImplementation/ SI/ Consulting PartnerPrincipal designer and contractor working with Zonegreen on installing DPPS at Northern Trains' Botanic Gardens depot in Hull. RTS aligned values with Network Rail approvals, timely installation, and handover process.
• Balfour BeattyminorImplementation/ SI/ Consulting PartnerContractor for the South Western Railway's Southsea depot project where Zonegreen installed a Points Converter system to control vehicle movements in and out of siding roads.
• Octavius InfrastructureminorImplementation/ SI/ Consulting PartnerInfrastructure company that worked with Zonegreen to deliver the Wimbledon Traincare Depot DPPS project, replacing the existing obsolete safety system.
• Andrew EngineeringminorImplementation/ SI/ Consulting PartnerAustralian partner through which Zonegreen installed DPPS at the High Capacity Metro Trains maintenance facility in Pakenham, East Victoria — a 16-road system with visible and audible warnings.
• Northern Rail Infrastructure TeamminorImplementation/ SI/ Consulting PartnerPartner in the installation of DPPS at Northern Trains' Botanic Gardens depot in Hull, working in partnership with RTS Infrastructure.

Scale indicators8 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Pilz GmbH & Co. KG: German-headquartered safety automation specialist offering safety relays, PLCs, and machine safeguarding solutions. Direct competitor in industrial machine safety interlocks and switchgear isolation.
• SICK AG: Global manufacturer of industrial sensors and safety systems, including safety light curtains and locking devices used in hazardous industrial environments comparable to Sentric's trapped-key offerings.
• Euchner GmbH + Co. KG: Specialist in safety switches, interlocks, and key transfer systems for machinery guarding. Closely comparable product set to Castell/Kirk in trapped-key and access interlocking.
• Schmersal Group: Family-owned German manufacturer of safety switching appliances and trapped-key interlocks for industrial machinery. Overlapping product portfolio with Castell and STI brands.

Broad incumbents

• ABB: Multinational broadline industrial automation and electrification OEM that supplies safety and switchgear products into Sentric's served verticals. Van, Sentric China's Marketing Manager, previously worked at ABB as R&D Engineer.
• Siemens AG: Global industrial conglomerate with safety-integrated automation and rail depot products. Operates depots where Zonegreen installs DPPS (e.g., Three Bridges), positioning Siemens as both a partner and broad-spectrum competitor.
• Eaton Corporation: Diversified power management company producing switchgear and safety components for industrial customers. Adjacent competitor in electrical isolation and industrial safety markets.
• Rockwell Automation: Larger industrial automation incumbent offering safety PLCs and machine safeguarding solutions. Comparable in target verticals but with a much broader portfolio than Sentric's specialist focus.

Emerging players

• Mechan: UK-based specialist in depot and rail maintenance safety equipment, overlapping with Zonegreen's rail depot protection focus. Smaller and more narrowly focused than Sentric.
• Banner Engineering: Manufacturer of industrial safety devices including interlocks and access control solutions for hazardous machinery. Competes at the device level with Kirk and Castell offerings in industrial safety.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/sentric-safety-group

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Subsidiaries5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sentric Safety Group