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TTI has steadily grown to become the world’s leading passive and connector specialist in the electronic component industry. TTI maintains an extensive inventory and offers the best electromechanical choices in the industry, meeting almost any requirement of our customers. The company’s basic strategy is to focus on a specific range of products and strive to be the industry’s leading distributor. No other company offers the unique combination of benefits that TTI provides. We maintain an extensive inventory of relays, including: automotive, general purpose, high frequency / RF, industrial, low signal - PCB, safety, solid state, time delay and relay sockets & hardware, from the industry's finest manufacturers.
The team of specialists at TTI has more experience in electromechanical product areas than any other distributor. All TTI employees participate in company-wide training programs, which have helped create the most product-knowledgeable team in the industry. Additionally, customers can rely upon the TTI sales team as a valuable resource of information and guidance.
Featured Relay Products
// Posted by:
Total reported sales for all relay categories in North America for the fourth quarter of 2014 were 3% lower than the previous quarter and up 10% from the same quarter of 2013. Sales units for Q4 2014 ran 3% below units sold in Q3 and 7% more than Q3 of 2013. Keep reading...
// Posted by:
Total reported sales for all relay categories in North America for the third quarter of 2014 were 2% higher than reported in the previous quarter and up 8% from the same quarter of 2013. Sales units for Q3 2014 ran 1% below Q2 and 3% more than Q3 of 2013. Keep reading...
// Posted by:
Total reported sales for all relay categories in North America for the first quarter of 2015 were 4% lower than reported in the previous quarter and up 1% the same quarter of 2014. Sales units for Q1 2015 came in less than 1% above Q4 and 2% less than Q1 of 2014. Keep reading...
Relays are available at TTI Inc. from industry leading manufacturers. TTI is an authorized distributor for many relay manufacturers including: Omron, Panasonic and TE Connectivity.
Automotive Relays and Modules
Automotive relays and modules
are optimized for use in motor vehicles (lower voltage DC loads). Modules package one or more relays with other circuitry. Panel mount, plug-in, and PC board versions of these products are offered. Electric wheelchairs and battery powered
material handling equipment are among other applications for these products. These relays typically do not carry marks from agencies such as UL, CSA, VDE, etc.
General Purpose Relays
General purpose relays
are typically rated to carry maximum currents from five to 20A in a variety of commercial and industrial applications. With one to eight poles, they were originally designed to be plugged into a socket or mounted to a panel, but some also offer PC terminals as an option. Both open and enclosed models are included, and there are many contact and enclosure options. Some offer indicators and mechanical test buttons as options.
Low Signal Relays
These hermetically sealed low signal relays
, rated 5A or less, are designed for applications in demanding conditions (extremes of temperature, shock, vibration, etc.). They offer from one to six poles, and some can switch up to 6GHz. Enclosures range from TO-5 and 0.100
grid relays to full size (crystal can). PC board, plug-in and panel mount types are offered. Models meeting military and aerospace specifications are available.
are electrically-operated switching devices that consists of two thinn, magnetic strips (reeds) encapulated in a glass envelope. When a coil around the glass envelope is energized, the resulting magnetic field brings the reeds together and closes the contacts. Typcially, the leads are made of nickel-iron alloys. Most reed relays have higher coil resistances and provide faster switching speeds than standard relays.
have contacts that are mechanically linked so that their normally open contacts cannot be closed simultaneously, even in the event of a malfunction such as welded contacts. They are used in elevators, escalators, light curtains, press controls, and other
critical applications. These enclosed relays with two, four, or six poles are designed for PC board mounting, but some models have been adapted for DIN rail mounting.
Solid State Relays
The hermetically sealed or encapsulated solid state relays
are designed for application in demanding conditions (extremes of temperature, shock, vibration, etc.). Solid state relays perform their switching function with solid state components. They offer one, two, or four outputs and can switch up to 125A. Some incorporate circuit protection or other logic functions in addition to their switching capability. PC board and panel mount types are included. Models meeting military and aerospace specifications are available.
Time Delay Relays
Time delay relays
are designed for application in demanding conditions (extremes of temperature, shock, vibration, etc.). They combine an internal timer, fixed or adjustable, with either an electromechanical or solid state output relay and contacts rated up to 10A. Models meeting military and aerospace specifications are available. PC board and panel mount types are included. Many of these products are custom designed to meet a customer’s specific requirements.
Things to Consider
Characteristics of relays should be understood when choosing a relay. Some important relay specifications include
the load types, coil options, contacts and arrangements, relay housings, and mountings.
Load types are the maximum permissible voltage and the maximum permissable amperage the relay can handle,
both volts and amps. Both the size of the load and its type are important. There are four types of loads: Resistive load, Inductive load, AC or DC, and High or Low Inrush.
Characteristics of coils should be understood as a part of the relay chosen. Some important specifications include: Coil Characteristics, Pick-Up Voltage, Drop-Out Voltage, Maximum Continuous Voltage, Nominal Operating Current, Nominal Operating Power and Coil Resistance.
- The contacts are the most important constituent of a relay. Their characteristics are significantly affected by
factors such as the material of the contacts, voltage, and current values applied to them (especially the voltage
and current waveforms when energizing and de-energizing the contacts), the type of load, operating frequency,
- Contact Arrangement denotes contact switching combinations available on a relay and are defined in terms of
number of pole, number of throws, normal position, and the sequence to make or break.
- Relays can be sealed in a number of ways, such as: Plastic Housing, Semi-sealed, Fully Sealed, Hermetically Sealed, and Unsealed.
- There are several typical ways for relays to be mounted and terminated: Socket, PCB or Chassis.