Relay roundup: small, dedicated, and economical

Just like television was supposed to end radio, and radio was supposed to finish off newspapers… PCs were supposed to end programmable logic controllers, and PLCs were supposed to finish off relays. I’m pleased to observe that newspapers and relays have adapted and are still thriving in a vast number of marketplaces.

Here’s a roundup of new relays, ranging from board-mounted chips to those with control capabilities that rival some PLCs. They’re in alpha order by manufacturer.

American Zettler offers the AZ986 plug relay in the 280-ISO format in a 40A version. Also available is the 20 A AZ984, they target automotive and other rugged applications.

Fail safe with the ”G-Latch” relay from Brentek.

Brentek G-1AMPx-LTCH is a dry output relay-switching module. The 1 A Latching Relay provides fail-safe control by latching to the last output contact state prior to power down. Contact are rated 0.5A/1A ac/dc and switching time is under 3 mS.

Dwyer has Model SSR-15 Instrinsically Safe Relay, with low-power switching and solid-state reliability, without explosive-proof housings. Operating and load voltages are 105-125 V ac, maximum load current is 5 A, and switch type is SPDT normally open.

Electroswitch Control Switch RElay provides manual and supervisory control of power circuit breakers. Stacking allows use of up to 20 contacts in the same deck. Contact ratings are 60 A for 1 min. and 30 A continuous, at up to 600 V ac.

Greenwich Electronics GEI GP7 Serice Electromechanical Relays are in 5 to 110 V dc coil voltages and SPDT and DPDT contact configurations with 5 kV dielectric strength and 10mm creepage distance. Package is 15.7mm high, with Class B or Class F insulation, they have 16 A contact rating in single-pole and 8 A in two.

HBControls Intelligent Control Solid Sate Relay Assemblies can interface with a variety of control input signals, and are rated for loads up to 100A at 40 deg C. Models are available for line voltages of 24-280 V dc, 48-530 V ac, and 48-530 V dc.

International Rectifier PCY116 is a microelectronic relay that enables use of test-signal frequencies up to approximately 450 MHz, for semiconductor automated test equipment. The device replaces dry or Mercury-wetted reed relays in many systems to improve reliability, performance, and decrease size.

Moeller Electric ‘easy’ 800 control relay combines PLC performance with the handling of a relay; 400, 600 models also are shown.

RKC’s SSN relay is UL recognized, and CE and CSA certified.

Moeller Electric Corp . ‘easy’ 800 Programmable Control Relay features 25 function blocks to handle 32-bit math processing, high-speed counter and encoder functions, and permits networking of up to eight relays. It fits automation applications from 18-320 I/O points and network distances of up to 3,200 ft. Each can be monitored from a PC and has an LCD that displays up to 32 screens of test with 64 characters per screen, and up to four operational variables.

RKC Instrument SSN (DIN-rail mount) Single Phase Solid State Relays are 21.5 x 100 x 78 mm for 15 and 25 A maximum current. It accepts dc input signals of 4.5-30 V dc. SSJ Single Phase Solid State Relays are 15, 25, and 45 A and 41 x 30 x 60 mm.

Teledyne GRF300 is 0.375 in. (9.52mm) dia., 0.315 in. (8 mm) tall, and 0.09 oz. (2.55g).

Teledyne Relays Series GRF300 and GRF303, high repeatability, broadband TO-5 electromechanical relays provide surface-mounted solutions with improved RF signal repeatability over the frequency range, in 5 and 12 V dc.

—Mark T. Hoske, Control Engineering, editor-in-chief, MHoske@cfemedia.com

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