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OP7821 Solid State Relay Module


The OP7821 provides 16 isolated solid-state relay outputs that can operate up to 250V in both AC and DC configuration.

Channel Description

Each isolated output is a single-pole normally-open solid-state relay with an integrated current-limiting feature that can replace electromechanical relays while enhancing the robustness of wireline-interface applications.

The electrical circuit also implements thermal shutdown.

The dynamic characteristics and current limits of the channel are as follows:

operating frequency example

Switching speeds

Turn on
  • lF=5mA,
  • lL=100mA

Turn offtoff0.16
Current Limit

AC/DC configuration
  • IF=5mA,
  • VL=±5V,
  • t=5ms

DC configuration

Face Plate

The OP7821 faceplate holds one DB37F connector.

DB37F Pin Assignments

The connector respects OPAL-RT standard DB37 pinout.


Product nameOP7821
Part number126-0458
Product typeOP7821 solid state relay
Connector typeDB37F
Isolation Voltage3750Vrms (between simulator and user equipment)
Dimensions18.8 x 16.4 cm (7.4 in x 6.46 in)
Operating temperature10 to 40 ºC (50 to 104ºF)
Storage temperature-55 to 85ºC (-67 to 185ºF)
Relative humidity10 to 90%, non-condensing
Maximum altitude2,000 m (6562 ft.)

OPAL-RT TECHNOLOGIES, Inc. | 1751, rue Richardson, bureau 1060 | Montréal, Québec Canada H3K 1G6 | | +1 514-935-2323