FUNCTIONAL DEVICES INC / RIB

Functional Devices, Inc. designs and manufactures a broad line of low-voltage power, control, and interface products for the building automation, HVAC, lighting, and industrial control markets. The company is known for its RIB (Relay In a Box) product family, which packages relays, transformers, and power supplies in enclosed, panel-mount, or wall-mount configurations. Functional Devices products are commonly specified by electrical engineers, control contractors, and maintenance teams for their modularity, ease of installation, and compatibility with standard control voltages. The product families include Class 2 transformers and power supplies, enclosed relays, current sensors, and rocker switches. These components are used to step down line voltage to safe control levels, provide isolated switching, and monitor current in control circuits. Many units are available with screw terminal connections, on/off switches, and built-in circuit breakers for overcurrent protection. The Class 2 transformers and power supplies are available in power ratings from 40 VA to 300 VA, with input voltages including 120V AC, 347V AC, and 480V AC, and output voltages typically 24V AC. Mounting options include wall-mount and panel-mount enclosures. 3G Electric supplies the Functional Devices / RIB line to industrial and commercial customers worldwide. The catalog includes enclosed and panel-mounted Class 2 transformers, power supplies, and related control accessories. 3G Electric provides technical specifications, datasheets, and support to help buyers select the correct VA rating, input voltage, and mounting configuration for their application. The product line is suitable for retrofit and new construction in facilities such as manufacturing plants, warehouses, data centers, and commercial buildings. Functional Devices products are recognized for their consistent form factors and straightforward wiring, which simplifies maintenance and reduces installation time. The RIB series, in particular, is widely used in HVAC control panels, lighting contactor panels, and pump control panels. 3G Electric maintains inventory and can source non-stock items to meet project timelines. For technical buyers, the key considerations when specifying Functional Devices products include: input voltage compatibility, output voltage and VA rating, enclosure type (wall or panel), termination style (screw terminals), and the presence of integral circuit breakers or switches. The Class 2 transformers comply with applicable UL and CSA standards for low-voltage control circuits. 3G Electric's catalog provides detailed specifications for each SKU, including MPN, power rating, input/output voltage, and mounting type. This allows procurement specialists and plant engineers to cross-reference existing installations and select drop-in replacements or upgrades. The Functional Devices / RIB line is part of 3G Electric's broader offering of industrial electrical and control components, which also includes burners, pumps, gas controls, and related equipment. 3G Electric ships globally and supports customers with quote requests, technical documentation, and order fulfillment.

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BrandFUNCTIONAL DEVICES INC / RIB

CategoryEnclosed & Panel Mounted Class 2 Transformers

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About FUNCTIONAL DEVICES INC / RIB

Common Applications

HVAC control panels — Functional Devices RIB Class 2 transformers (e.g., PSH75AB10) provide 24V AC power for thermostats, relays, and zone valves.
Lighting contactor panels — RIB power supplies (e.g., PSMN200A) step down 347V AC to 24V AC for lighting control relays and occupancy sensors.
Pump control panels — Enclosed Class 2 transformers (e.g., PSH200A) supply 24V AC to pump start relays and float switches in water/wastewater facilities.
Industrial automation — RIB current sensors and relays monitor and switch low-voltage control circuits in PLC-based systems.
Commercial building automation — Functional Devices power supplies (e.g., PSH100AB10-EXT2) provide isolated 24V AC power for building controllers and actuators.
Data center cooling — RIB transformers (e.g., PSH300A) power control circuits for CRAC units and economizer dampers.

Frequently asked questions

Common questions about FUNCTIONAL DEVICES INC / RIB from 3G Electric.

What is the difference between the Functional Devices RIB Class 2 transformers and standard transformers?

Functional Devices RIB Class 2 transformers are enclosed and often include additional features such as screw terminal connections, on/off switches, and built-in circuit breakers. They are designed for wall or panel mounting and are available in power ratings from 40 VA to 300 VA. Standard transformers may be open-frame or require separate enclosures. The RIB series simplifies installation by providing a complete, ready-to-mount assembly that meets Class 2 requirements for low-voltage control circuits.

What input and output voltage options are available in the Functional Devices Class 2 power supplies?

Functional Devices Class 2 power supplies are available with input voltages including 120V AC, 347V AC, and 480V AC. The output voltage is typically 24V AC. For example, the PSH75A75AB10 has a 120V AC input and 24V AC output at 75 VA, while the PSMN200A accepts 347V AC input and provides 24V AC output at 200 VA. The PSH200A accepts 480V AC input and provides 24V AC output at 200 VA. These options allow compatibility with various commercial and industrial power systems.

How do I select the correct VA rating for a Functional Devices RIB transformer?

To select the correct VA rating, calculate the total VA requirement of all loads connected to the transformer's secondary. This includes relays, contactors, sensors, and other control devices. Sum the VA ratings of each device, then choose a transformer with a VA rating at least 20-25% higher than the total load to allow for inrush current and future additions. Functional Devices offers ratings from 40 VA to 300 VA. For example, if the total load is 60 VA, a 75 VA model such as the PSH75AB10 would be appropriate.

Are Functional Devices RIB products suitable for outdoor use?

Functional Devices RIB products are typically designed for indoor use in controlled environments. The enclosures are not rated for outdoor exposure unless specifically noted. For outdoor applications, they should be installed within a weatherproof enclosure or cabinet. The standard wall-mount and panel-mount enclosures provide protection against dust and incidental contact but are not intended to withstand rain, snow, or extreme temperatures. Always refer to the product datasheet for the specific environmental rating of each model.

What is the purpose of the built-in circuit breaker in some Functional Devices Class 2 power supplies?

The built-in circuit breaker provides overcurrent protection for the transformer's secondary circuit. If the load exceeds the rated current or a short circuit occurs, the breaker trips to interrupt power, preventing damage to the transformer and connected devices. This eliminates the need for separate fusing or breakers in many installations. Models such as the PSH200A and PSMN200A include this feature. After tripping, the breaker can be manually reset once the fault is cleared.

Can 3G Electric provide cross-references for Functional Devices RIB part numbers?

Yes, 3G Electric can assist with cross-referencing Functional Devices RIB part numbers to ensure compatibility with existing installations. Provide the MPN or SKU, and our technical team can verify specifications such as input/output voltage, VA rating, mounting type, and termination style. We can also suggest alternative models if a direct replacement is not available. This service helps maintenance managers and procurement specialists avoid downtime and ensure correct fit and function.