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Availability: Obsolete
OBSOLETE SNAP Isolated 4-Channel Mechanical Power Relay Output Module, Form A

Production Specification

*** The SNAP-OMR6-A is obsolete and no longer available. ***
It has been replaced by the SNAP-OMR6-C, which is a Form C mechanical relay. It is a pin-compatible, drop-in replacement and offers the option to wire each of the four mechanical contacts as normally open or normally closed.

You may also want to consider the SNAP-OMR6T-C, which includes integrated transient suppression.

The SNAP-OMR6-A mechanical power relay output module offers four channels of switching for up to 250 VAC or 30 VDC, 6 amp loads. All four mechanical contacts are normally open.

Mechanical power relay output modules handle more current than any other SNAP output module and provide channel-to-channel isolation. Fusing is not provided; you must provide fusing when wiring the module.

Each contact on the SNAP-OMR6-A can carry 6 amps. Having more than one channel on at the same time does not reduce the amount of power each channel can carry. Because channels are not polarity sensitive, each channel can switch either AC or DC power, thus potentially reducing the number of modules needed.

In solid-state SNAP AC output modules, possible leakage current might cause an electronic input to stick in the ON state. In contrast, a channel on these mechanical power relay modules presents a true open circuit when it is off, and the modules can be used exactly as solid-state AC modules are used.

Part of the SNAP PAC System, the module mounts on a SNAP PAC rack with a SNAP PAC brain or rack-mounted controller. Analog, digital, and serial I/O modules can all be on the same rack. Such an I/O unit is also well suited for PC-based control or for use as intelligent remote I/O for an Allen-Bradley Logix PLC system, such as ControlLogix, MicroLogix, or CompactLogix.

The SNAP-OMR6-A is compatible with all SNAP PAC brains and rack-mounted controllers, including both standard wired models and Wired+Wireless™ models. It is also compatible with SNAP Ultimate, SNAP Ethernet, and SNAP Simple brains, as well as other SNAP brains such as the serial B3000 and the B3000-B. It can also be used on B-series and M-series mounting racks.


SNAP-OMR6-A [Obsolete]

Field Side Ratings (each channel)


Contact Configuration

Form A (SPST, normally open)

Line Voltage - Range

0–250 VAC or 0–30 VDC

Current Rating

6 amps switching @ 250 VAC / 30 VDC

Surge Current

6 amps

Minimum Load

5 VDC, 10 mA

Contact Resistance

100 milliohms

Switching Power

1500 VA / 144 W (DC)

Peak Blocking Voltage

250 VAC / 30 VDC

Channel-to-channel isolation

300 VAC (1500 Vtransient)

Logic Side Ratings


Pickup Voltage

1 V @ 2 mA

Dropout Voltage


Control Resistance

220 ohms

Logic Supply Voltage

5 VDC ± 0.25 VDC

Logic Supply Current

160 mA maximum

Module Ratings


Number of Channels Per Module


Turn-on Time

8 milliseconds

Turn-off Time

8 milliseconds

Torque, hold-down screws

Not to exceed 1 in-lb (0.11 N-m)

Torque, connector screws

Single gray connector: 5.22 in-lb (0.59 N-m)

Black connectors: 1.7 in-lb (0.2 N-m)


-20 to 70 °C, operating
-30 to 85 °C, storage

Agency Approvals


Mechanical Life

10 x 106 operations

Operational Life

30 x 103 operations


30 months

SNAP Mechanical Power Relay Output Module Data Sheet

The SNAP-OMR6T-C and SNAP-OMR6-C mechanical power relay output modules give you four isolated channels for switching loads up to 6 amps at 250 VAC or 30 VDC.

NOTE: Specifications and wiring diagrams for the obsolete SNAP-OMR6-A module are included in this data sheet for reference.

New Opto 22 Mechanical Relay Modules Switch Up To 12X the Power in the Same Amount of Space

Opto 22's SNAP-OMR6 Modules Offer Standard, Simpler Way to Switch Higher Loads in Energy Management and Power-Related Applications

CE Declaration: Low Voltage

This document is the Manufacturer's Declaration for the listed products as mentioned in the attachment - to which this confirmation refers - that they are in accordance with the mentioned European, international and/or national standards and regulations.

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