Safety Relays


 

 

relay

 

 

When loads, such as valves or motors, cannot be driven directly by a safety PLC or by an emergency

push button, an interposing relay becomes a necessity. As an example, when the power required to switch the load is greater than what can be provided by the PLC or when multiple contacts are required to be driven by the same signal, the use of a relay is a must.

In today’s high integrity applications a standard relay is no longer acceptable. Whether it is for a ESD, F&G, BMS or for any other critical application, a Safety (SIL 3) Relay must be used.

GM International SIL 3 Relays are available in various contact configurations and rating to cover the majority of applications; they are available with standard DC as well as with AC coil.
Typical applications are shutdown or relief valves control, Fire & Gas valve control, Turbine shut down, AC/DC motors control center, etc.
For each application the specific Safety Function must be determined to select the correct Safety Relay. The Safety Function controls the operating condition of the SIF, therefore of the Safety Relay.

Safety Functions can be basically divided in two main groups:

  • ETS or Energize to Safety or
  • Trip and DTS De-energize to Safety or Trip.

From which four operating conditions:

  • NE Relay Coil – NC Relay Contacts ( Load Normally Energized )
  • NE Relay Coil – NO Relay Contacts ( Load Normally De-Energized )
  • ND Relay Coil – NO Relay Contacts ( Load Normally De-Energized )
  • ND Relay Coil – NC Relay Contacts ( Load Normally Energized )

By “NE Relay Coil” we mean a High condition (power on) at the relay coil terminals and by “ND Relay Coil” we mean the exact opposite, a Low condition (power off). NC or NO Relay Contacts determine whether power is available to the load under normal operating conditions or not; with NC contacts the load is Normally Energized and with NO contacts the load is Normally De-Energized.
The Safety Function is to revert the above operating conditions. For example, with NE relay coil and NC relay contacts, DTS Safety Function is to disconnect power to the load by removing power at the relay coil (From High to Low condition); This is the most typical SIL 3 relay function for a NE Load. Or, with a NE relay coil and NO relay contacts, ETS Safety Function is to power-on load by removing power at the relay coil (From High to Low condition).

Other aspects in selecting the safety relay are: the load’s contacts rating; the number of contacts required to be driven by the same control signal; if a single line or both lines of the load must be switched ON or OFF.

For each GMI Safety Relay a data sheet containing schematics of all possible applications, as well as coil and contacts rating, is available.

 

D5000 Series SIL RelaysD5091S_A

D5000 Enclosure Characteristics

High channel density result from innovative circuit design using advanced surface mount components.

Plug-in screw terminal blocks to secure termination up to 2.5 mm2

35 mm (Top Hat) DIN-Rail

High packing density. Ultra slim 2 channels 12 mm wide

  • D5090S    4 A SIL 3 Relay Output Module for NE Load   Data Sheet
  • D5090S-086    5 A SIL 3 Relay Output Module for NE Load  Data Sheet
  • D5091S     4 A SIL 3 Relay Output Module for ND Load with ND or NE Relay condition     Data Sheet
  • D5094S      5A SIL 3 NE or ND with 2 x N/O Contacts   Data Sheet
  • D5095S      5A SIL 3 NE or ND with 2 x N/C Contacts   Data Sheet
  • D5290S     10 A SIL 3 Relay Output Module for NE Load    Data Sheet
  • D5290S-078    5 A SIL 3 Relay Output Module for NE or ND Loads with NE or ND Relay condition  Data Sheet
  • D5290S-079    5 A SIL 3 Relay Output Module (115 Vac coil voltage) for NE or ND Loads with NE Relay condition   Data Sheet
  • D5290S-080  10 A SIL 3 Relay Output Module for NE Load and 115 Vac coil voltage  Data Sheet
  • D5290S-084  5 A SIL 3 Relay Out Module (110 Vdc coil voltage) for NE or ND Loads with NE Relay  Data Sheet
  • D5290S-091 10 A SIL 3 Relay Output Module for NE Load and 230 Vac coil voltage  Data Sheet
  • D5291S     10 A SIL 3 Relay Output Module for ND Load with ND or NE Relay condition    Data Sheet

D5000 Series Smart SIL Relaysdownload

Switching of Safety-Related circuits demands the use of specific SIL certified Relay Output modules, capable of delivering the highest grade of availability and functional safety.
These units are so much more than just a relay; they not only perform the desired safety function, but also provide full Load & Line Internal Diagnostics: load voltage and current, load resistance (patented), leakage from load to earth, coil integrity and internal faults. Moreover, MODBUS communication allows the units to be remotely interrogated and configured.
Hardware is SIL 3 certified, while diagnostic functions are now also SIL 2 certified by TUV: they remain two independent features, which can be used separately or together.

For installation in Zone 2 / Div. 2 Hazardous location. All models are ATEX, IECEx and SIL certified.

  • D5096S      5 A SIL 3 NO contact Relay Out Module for NE or F&G/ND Load with OC and SC Diagnostics  Data Sheet
  • D5097S      5 A SIL 3 NC contact Relay Out Module for NE or F&G/ND Load withOC and SC Diagnostics   Data Sheet
  • D5293S     4A SIL 3 Relay Out Module for NE Load with Load and Line diagnostic    Data Sheet
  • D5294S     4 A SIL 3 NO contact Relay Out Module for NE or F&G/ND Load with open/short circuit diagnostic    Data Sheet
  • D5295S        4 A SIL 3 NC contact Relay Out Module for NE or F&G/ND Load with open/short circuit diagnostic   Data Sheet

D5000 Series SIL3 Loop Powered Switch RepeatersD5093S-D

Switching of Safety-Related circuits demands the use of specific SIL certified Relay Output modules, capable of delivering the highest grade of availability and functional safety.
These units are so much more than just a relay; they not only perform the desired safety function, but also provide full Load & Line Internal Diagnostics: load voltage and current, load resistance (patented), leakage from load to earth, coil integrity and internal faults. Moreover, MODBUS communication allows the units to be remotely interrogated and configured.
Hardware is SIL 3 certified, while diagnostic functions are now also SIL 2 certified by TUV: they remain two independent features, which can be used separately or together.

For installation in Zone 2 / Div. 2 Hazardous location. All models are ATEX, IECEx and SIL certified.

  • D5093S      Single Channel loop powered Digital I/P (24-220 VAC /VDC  D5093S Data Sheet
  • D5093D     Dual Channel loop powered Digital I/P (24-220 VAC /VDC  D5093D Data sheet

 

D1000 Series SIL RelaysD1092D

D1000 Enclosure Characteristics

High channel density resulting from innovative circuit design using advanced surface mount components.

Plug-in screw terminal blocks to secure terminations up to 2.5 mm2.

35 mm (Top Hat) DIN-Rail

22.5 mm wide DIN-Rail mounting modules.

  • D1092S         1 channel, Relay Output Module for NE and ND Loads, SIL 3    D1092S Data Sheet
  • D1092D         2 channel, Relay Output Module for NE and ND loads, SIL 3    D1092D Data Sheet
  • D1092S-069   1 channel, NE Relay Output Module, SIL 3    D1092S-069 Data Sheet
  • D1092D-069   2 channel, NE Relay Output Module, SIL 3   D1092D-069 Data Sheet
  • D1093S         1 channel, Relay Output Module for NE and ND loads with diagnostics, SIL 3    D1093S Data Sheet

SIL Relays: If you can’t find the module you need below, then please contact us for further assistance or try the product finder function by clicking here

Subscribe to the Exloc Newsletter

Join the Exloc mailing list to receive the latest news and updates from our team.

You have Successfully Subscribed!