What Solid State Instruments does

Solid State Instruments (SSI), founded in 1998 and headquartered in Lafayette, Indiana, designs and manufactures solid-state pulse isolation relays and pulse metering devices for the electric, water and gas utility industries, as well as for energy service companies. The company's product portfolio spans Elite and Standard pulse relay lines, multi-channel totalizers, and a broad set of pulse transmission solutions covering wired (tone, current loop), wireless (900MHz Frequency Hopping Spread Spectrum up to 5,000 feet line-of-sight), and fiber optic (up to 68 miles single-mode) modalities. Specialty devices include the MPG wireless meter pulse generators that bridge AMI smart meters to legacy KYZ pulse outputs via Zigbee, the PMC-1 Pulse-to-Modbus TCP converter for Ethernet-accessible metering data, optical pulse pickups, load control relays, and supporting power supplies and accessories. The firm eliminated mercury-wetted relays from its product line in 2009 and ships only solid-state designs.

The business operates on a hardware-sales revenue model with three streams: pulse isolation relays, specialty metering devices, and accessories/power supplies. Distribution is direct via enterprise sales ([email protected], phone (765) 449-5500) with quote-based pricing and no public price list; an online relay selection tool supports the buyer's specification process. Customers are utility procurement and metering engineering teams, with primary demand from electric utilities and secondary demand from water/gas utilities and energy service companies. The market is North American. SSI was acquired by Radian Research in January 2025 and continues to operate as a brand under Radian, inheriting Brayden Automation's heritage of delivering cost-effective solutions to the electric power distribution industry while gaining access to Radian's broader energy management capabilities.

Name

Solid State Instruments

Legal name

Solid State Instruments

Website

https://solidstateinstruments.com

Company type

Private

Founded year

1998

Operating status

Operating

Ownership category

akta.pro rank

Product category

Utility Metering Equipment

NAICS

Relay and Industrial Control Manufacturing (335314), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451)

SIC

Instruments For Meas & Testing Of Electricity & Elec Signals (3825), Industrial Instruments For Measurement, Display, And Control (3823), Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Optocouplers & Solid-State Relays (Isolation Discretes) (HDAHAHAM)

akta.pro secondary industries

Electromechanical Components (Relays, Switches, Potentiometers, Encoders) (IMAGAJAB), Power Quality, Metering & Monitoring (HDACAJAG), Isolation & Signal Conditioning ICs (Digital Isolators/Instrumentation) (HDAHAIAI)

Keywords

• Pulse isolation relays
• KYZ pulse metering
• Utility metering equipment
• Solid state relays
• Pulse transmission systems

Headquarters

HQ city

Loveland

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Hardware Sales - Pulse Relays: SSI generates revenue through the sale of pulse isolation relays, including Elite and Standard product lines with various configurations (1-24 channels).
2. Specialty Metering Devices: Revenue from specialty devices including wireless pulse generators (MPG series), pulse-to-Modbus converters (PMC-1), and fiber optic pulse links.
3. Accessories and Power Supplies: Sales of auxiliary products including solar power supplies, metering power supplies, and accessories for pulse metering applications.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Solid State Instruments manufactures and sells solid-state pulse isolation relays, KYZ pulse metering devices, and specialty pulse products for electric, water and gas utilities, and energy service companies. The product portfolio includes Elite and Standard pulse relay lines, pulse totalizers, wireless and fiber optic pulse links, pulse-to-Modbus converters, and customer interface relays. All products use mercury-free solid-state designs with built-in transient voltage protection and integrate legacy KYZ metering infrastructure with modern AMI smart meters.

Product overview

Solid State Instruments (SSI) provides a comprehensive portfolio of pulse isolation relays and pulse metering devices for electric, water, and gas utilities, and energy service companies. The product offering is organized into multiple lines: Elite Series (premium modular and self-contained low voltage relays with enhanced features), Standard Series (cost-effective pulse relays), Totalizers (multi-channel pulse aggregation devices), and Specialty Devices (wireless pulse generators, protocol converters, load control relays, power supplies). SSI also offers multiple transmission technologies for remote pulse delivery including wireless (FHSS 900MHz), fiber optic (OPL series supporting 1,000 feet to 68 miles), tone transmission (DTMF over telephone/wire), and current loop (PTR/CLR series for 2-4 mile runs). All products use solid-state relays, having eliminated mercury-wetted relays in 2009. The company was acquired by Radian Research in January 2025 and continues to serve the electric power distribution industry.

Differentiator

Problem solved

Functional benefit

Brands

• Elite: SSI Elite Relays - Premium modular and self-contained low voltage pulse isolation relays including RPR, PIR, PCR, DPR, CIR, and LMR series.
• Standard
• Totalizers
• Pulse Links
• Specialty Devices
• Solar Power Supplies
• Accessories

Products and services

• SSI Elite Pulse Relays Premium line of modular and self-contained low voltage pulse isolation relays including RPR-1PS through RPR-903PS, PIR-1PS+, PIR-2PS+, PIR-3PS+, PCR-3PS, DPR-22PS models, plus Customer Interface Relays (CIR series) and Load Management Relays (LMR series) for utility metering applications.
• SSI Standard Pulse Relays Standard line of pulse isolation relays including SPR-1, SPR-2, SPR-3, SPR-22, SPR-24, SPR-36, SPR-44, SPR-448, PCR-4, RTR-2+, RTR-22+, DPR-1, DPR-4, ETR-3, SPR-3E, and SPR-24E models for various pulse metering applications.
• SSI Metering Pulse Totalizers Metering pulse totalizers including MPR-4 (4-channel pulse register), MPT-2C, MPT-4C, MPT-8C (2/4/8 channel totalizers), NPR-1 (4-input net pulse register), and NPR-8 (8-input net pulse register) for aggregating pulse data from multiple metering sources.
• Wireless Pulse Links (PRL Series) Point-to-point wireless pulse transmission systems using FHSS technology in the 900MHz band, including PRL-1200C and PRL-1600C for short-hop pulse applications up to 5,000 feet line-of-sight.
• Optical Fiber Pulse Links (OPL Series) Fiber optic pulse transmission systems including OPL-1B, OPL-1C (1-channel), OPL-4B, OPL-4C (4-channel), and OPL-8B, OPL-8C (8-channel) for distances from 1,000 feet to 68 miles.
• Tone Transmitters and Receivers (TT/TR Series) DTMF tone-based pulse transmission systems including TT-4C tone transmitter and TR-4C tone receiver for transmitting pulses over twisted wire pairs or leased telephone lines up to unlimited distances.
• Current Loop Pulse Relays (PTR/CLR Series) Long-distance pulse transmission via 2-wire current loop including PTR-1PS pulse transmitting relay (up to 4 miles) and PTR-2PS pulse transceiving relay (up to 2 miles), paired with CLR-1PS, CLR-2PS, CLR-3PS receiving relays.
• Wireless Meter Pulse Generators (MPG Series) AMI smart meter integration devices using Zigbee radio technology to synthesize KYZ pulses from HAN network data. Models include MPG-1C, MPG-2, MPG-2ES, MPG-3, MPG-3E, MPG-3ES, MPG-3SC for utilities transitioning to AMI meters while maintaining legacy pulse outputs.
• PMC-1 Pulse-to-Modbus Converter Device that reads two 2-Wire KY pulse inputs and provides energy use and demand information via Modbus TCP protocol over RJ-45 Ethernet. Includes EXP expansion boards for 4, 6, or 8 input channels.
• CIR-44 Customer Interface Relay Four-channel interface relay with independently programmed Form A contact outputs, offering Normal Pass-thru, Pass-Through with Value Conversion, or Positive/Negative Totalizing modes for pulse metering applications.
• Customer Interface Devices (CID Series) Low-cost fused KYZ termination devices including CID-1 (1-channel) and CID-2 (2-channel) that supplement electric meters' KYZ pulse initiators and provide fused connections between meters and customer energy control systems.
• Load Control Relays (LCR Series) Auxiliary load control relays including LCR-1, LCR-3B, LCR-4, LCR-5 for interfacing between meters and higher-current loads or control circuits in load management programs.
• Power Supplies (MPS, SPS, DCS Series) Metering and auxiliary power supplies including MPS-1 and MPS-2 (AC metering power supplies), SPS-1 (solar power supply with 10W panel and battery backup), DCS-1 (125VDC auxiliary supply), and DCS-2 (15-48VDC auxiliary supply).
• Portable Pulse Counter (PPC-1) Battery-powered field tool for testing meter KYZ pulse outputs with 8-digit display, 3VDC sense voltage, and 5-year battery life.
• Optical Pulse Pickups (OPP Series) Non-contact pulse monitoring devices. OPP-1 for meters with Optocom port (Landis+Gyr MAXsys, GE KV2c, Honeywell A3); OPP-1i for ITRON Sentinel/Centron and GE I-210 meters using infrared calibration pulse detection.
• PCL-1 Pulse-to-Current Loop Converter Converts 2-Wire KY pulse to 4-20mA analog signal representing instantaneous or average demand in kilowatts for integration with SCADA systems, PLCs, and recorders.
• Penguin Load Management Timers Energy management systems for load control during peak hours. Includes Penguin III timer (standalone) and Penguin 6300 (complete system with up to 63 load circuits via 21 relays) for TOU rate optimization.
• ETR-3 Event Time-Base Relay Divides 60Hz line frequency to time base pulses. ETR-3A outputs 1 pulse per second; ETR-3B outputs 1 pulse per minute, for SCADA and recorder interfaces.
• High-Speed Water/Gas Meter Relays (RTR Series) RTR-2+ and RTR-22+ high-speed pulse isolation relays designed for water and gas meters supporting up to 200 pulses per second with configurable input filter times.
• High-Speed Dividing Pulse Relays (DPR Series)

Named customers3 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• Radian ResearchcoreStrategic or Co-development Partner · 1 January 2025In January 2025, Solid State Instruments was acquired by Radian Research. SSI will continue to build on the tradition set forth by Brayden Automation of delivering cost-effective, customer-driven solutions to the electric power distribution industry.

Scale indicators1 record

Recent moves6 records

Expansion highlights5 records

Market position

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about Solid State Instruments