Recent Snap-OMR6-A and Snap-OMR6-C mechanical relay modules fill an important need for engineers, plant managers, technicians, and others seeking a cost-effective way to switch higher voltages and currents without need for breakout boards, header cables, or other interposing hardware.
The Snap-OMR6-A and OMR6-C power relay output modules have four separate channels of switching for up to 250 Vac or 30 Vdc, 6 amp loads. The modules are built in the same form factor as Opto 22’s standard Snap I/O modules. The modules have three times the rated current switching capability of standard Snap optically-isolated outputs, and 12 times the rated current switching capability of Snap reed relay modules-all in the same amount of rack space.
The features and capabilities of the two mechanical relay modules address at least three important customer needs. First, their ability to independently switch up to 6A per channel helps cut costs by eliminating need for additional hardware to switch the load. Second, they are ideal for applications with inrush currents and inductive, capacitive, or resistive loads. (In contrast, Opto 22’s current mechanical reed relay modules-which offer a max of 0.5A switching current and 120V ratings-are better suited for very low-current applications such as signal switching.) Finally, because the modules are mechanical (not solid-state) relays, each is capable of switching either ac or dc power. This feature potentially reduces the number of modules needed for any given application, and offers advantages for laboratory and testing applications where the polarity of the electrical circuit is subject to change.
Although the relays feature channel-to-channel isolation, the two also have distinct differences. The OMR6-A is a Form A, Single Pole Single Throw (SPST) relay with contacts that are normally open. The OMR6-C is a Form C, Single Pole Double Throw (SPDT) relay with mechanical contacts that can be wired as normally opened, normally closed, or both. The dual options let users safeguard their control applications. For example, in the event that power is lost, the contacts on the SNAP-OMR6-C module will return to the position that’s been designated as normal (open or closed), so equipment can continue to operate or shut down safely.
The modules will also prove useful for energy managers, building owners, and others looking to switch equipment on and off as part of their demand-response and other energy-management operations. The units are each priced at $92 and are available now.
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