FAQs

Select a category below to navigate, or scroll down to browse FAQs


General Information | General Purpose Relays | Latching Relays | Solid State Relays | Time Delay Relays | Sockets & Accessories


General Information
Can I get a certificate of compliance for ISO?
No, we follow ISO procedures, but we are not ISO certified.
What kind of wiring questions can technical support help me with?
Technical support will explain the wiring schematics of the SE Relays products. Technical support will not assist with wiring the Customer's application.
What does "maximum switching current" mean?
The maximum switching current is the maximum amount of current that the contacts can switch for the rated life cycle for a specific load.
Does the SE Relays product line include Mean Time Between Failure (MTBF) data for relays?
There is no data for Mean Time between Failure (MTBF) for relays, however we stipulate electrical endurance corresponding to specific current ratings.
What is the "operating time"?
The operating time is from when the Voltage is applied to the coil, and normally open contacts make.
Will your relays fit into sockets from other manufacturers?
Yes, most footprints are industry standards. However, mixed brands will not be UL listed.
Does the SE Relays product line include force guided contacts?
No, the SE Relays product line does not include force guided contacts. However, Schneider Electric does offer force guided contacts. The Schneider Electric website is www.schneider-electric.us.
Does the SE Relays product line include safety relays?
No, the SE Relays product line does not include safety relays. However, Schneider Electric does offer safety relays. The Schneider Electric website is www.schneider-electric.us.
Does the SE Relays product line include intrinsically safe relays?
No, the SE Relays product line does not include an intrinsically safe relays. The SE Relays product line includes Class 1 Division 2 relays available for hazardous locations.
My customer is requesting a relay that starts with a "W" and I have a similar part with out the "W". Are they the same part?
Yes, they are the same part. The "W" in front of the part does not indicate any differences. The "W" is no longer used in the designation of the current 199 series as well.
Does Schneider Electric offer a legacy cross reference guide for the SE Relays product line?
Yes, Schneider Electric does offer a cross reference guide on the www.serelays.com website for the SE Relays product line. The cross reference guide is located in the support tab.
Does Schneider Electric offer replacement coils for its relays?
No, Schneider Electric does not offer replacement coils for their relays. The entire relay needs to be replaced.
What is the SIC code for SE Relays products?
The SIC number is 5063.
What is the Cage Code for SE Relays products?
The cage code is 56365.
What is the ECCN number for SE Relays products?
The ECCN number is EAR99.
General Purpose Relays
I need an electromechanical relay, and my output is higher than 28 VDC, what relay series should I look at?
When selecting an electromechanical relay for an application with an output higher than 28 volts DC, a magnetic blowout would be needed. If the voltage is higher than 28 volts DC the current will be de-rated as well.
- The 750, 788, and 199 relay series include parts with blow out magnets.
- The 750 & 788 relay series designates code "69" for a blow out magnet.
- The 199 relay series designates code "B" for a blow out magnet.
How do electromechanical relays work?
A magnetic coil moves an armature that makes or breaks a set or multiple sets of contacts.
What is a magnetic blow out? What is its importance?
An electromagnet or permanent magnet is used to dissipate and extinguish the arc formed when switching high current DC Loads. Blow out magnets are mostly used for DC switching applications.
Does SE Relays have Class 1 Division 2, relays?
Yes, the SE Relays product line includes Class 1 Division 2 hazardous location relays for groups A, B, C, and D, and comply with UL 1604. There are 3 different models of SE Relays Class 1 Division 2 relays. The electromechanical 750H and 782H series relays and the solid state 861H series relays.
Do the 782XBXH (2 pole) relays, and the 782XDXH (4 pole) relays have the same number of pins?
Yes, both the 782XBXH and the 782XDXH have 14 pins. The 782XBXH has dummy pins where the 782XDXH has all active pins.
Did SE Relays/ Schneider Electric acquire the Potter & Brumfield hermetically sealed relays?
Yes, SE Relays acquired the KHS & KR hermetically sealed relays. The part numbers now have SE Relays nomenclature. They are also dual marked with the old P&B part number.
Latching Relays
How does the 785 Dual (DC) coil latching relay work?
Coil 1: A1 (-) and A2 (+). Coil 2: B1 (-) and B2 (+). Set with coil 1 and reset with coil 2 removing power from coil 1 before coil 2 is reset, and vice versa.
How does the 785 single (DC) coil latching relay work?
In order to set and reset, polarity needs to be reversed on the coil.
How does the 785 single (AC) coil latching relay work?
This relay works similar to a dual coil Latching Relay. A1 & A2 are used to set, A1 & B2 are used to reset. Power must be removed from A2 before resetting B2. Power must be removed before resetting or setting the coil.
How does the 755 Dual (DC) coil latching relay work?
Applying voltage to pins 2 and10 will set the relay, and applying voltage to pins 3 and 6 to reset the relay. Power must be removed before setting or resetting the relay.
How does the 755 single (AC) coil latching relay work?
This relay works similar to a dual coil latching relay. Apply Voltage between pin 2 and 10 to set, and pins 3 and 6 to reset. Pins 6 and 10 can not be powered at the same time.
Solid State Relays
Does the SE Relays line have a solid state hermetically sealed relay used for hazardous locations?
No, SE Relays has an 861H series relay rated for Class I. Div 2, hazardous locations for groups A, B, C, and D. The 861H series is not hermetically sealed.
How is heat loss calculated for solid state DC relays?
For DC switching measure the current and calculate P= I_*R, where R is stated as ON state resistance (from our catalogs).
How is heat loss calculated for solid state AC relays?
Measure the RMS current and multiply it by 1.6.
What is the advantage of a solid state relay?
There are many advantages to solid state technology including long life, high reliability, vibration resistance, silent operation, and faster switching time.
What does "Zero Cross" mean?
Zero cross is related to solid state relays. The relays switch ON when the voltage crosses the zero phase of the wave cycle. The relays always turn OFF when the current crosses zero.
Are the 70S2 relays that were made by Grayhill the same as the 70S2 relays that SE Relays carries?
Most of the 70S2 Series that were acquired from Grayhill are the same, except for V- packs made in Mexico. The V-packs made in Mexico are snuberless, and present less leakage current in OFF state.
Time Delay Relays
Is the external control switch for the 820 series, TDRSRX, and TDRPRO series a powered switch or a dry contact?
The external control switch requires a dry contact. Power can not be applied to this input.
Are SE Relays timers electromechanical or solid state?
SE Relays timers are actually a combination of both electromechanical and solid state technology. The solid state electronics conduct the timing and functioning capabilities. The electromechanical electronics control the relay output.
Sockets & Accessories
What is the screw size of the 16-DCLIP-1?
The 16-DCLIP-1 has a 4MM Diameter screw.