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Select The Right Relay for The Right Application

TURCK 9/11/2018

Select the Right Relay for the Right Application
 
Reduction of contact erosion when switching DC loads

Increased contact gaps, double make contacts, and arc blow-out magnets to reduce contact erosion (burn offs). Compared with standard contacts, the reliability can be remarkably increased when using customized contacts for switching DC loads with breakaway sparks. Increased contact caps, double make contacts and blow out magnets are causing a longer distance for the electric arc. Electric arcs are extinguished quickly and increase significant the lifetime of the contacts.

Suitable relays for this application

Series Type Base Gap Extras DC-1 rating
MRC C2-G2x round 1.7 mm - 1.2 A 110 V DC
MRC C3-G3x round 1.7 mm - 1.2 A 110 V DC
MRC C3-M1x round 2x 1.7 mm ≥ 3 mm Double make contacts; Blow out magnet 10 A 220 V DC
MRC C3-X1x round 2x 1.7 mm ≥ 3 mm Double make contacts 7 A 110 V DC
MRC C4-X2x square 2x 1.7 mm ≥ 3 mm Double make contacts 7 A 110 V DC
MRC C5-G3x square 1.7 mm - 1.2 A 110 V DC
MRC C5-X1x square 1.7 mm ≥ 3 mm Double make contact 7 A 110 V DC
MRC C5-M1x square 2x 1.7 mm ≥ 3 mm Double make contacts; Blow out magnet 10 A 220 V DC
MRC C5-M2x square 2x 1.7 mm Blow out magnet 7 A 110 V DC
QRC C7-G2x square 1.5 mm - 0.8 A 110 V DC
QRC C7-X1x square 2x 1.5 mm Double make contacts 6 A 110 V DC
IRC C10-G1x square 1.0 mm - 10 A 30 V DC
IRC C12-G2x square 1.0 mm - 5 A 30 V DC
DIN CMC1 DIN 14 mm - Adjustable start and breaking ramps 10 A 24 V DC

Contacts for high inrush current

Tungsten contacts have a higher melting point that help resist high power peaks and protect main contacts. High power peaks during switch-on of electrical loads, for example when switching power supplies and ballasts can lead to welding of the contacts. Early make tungsten contacts resist high inrush currents and avoid contact welding.

Suitable relays for this application

Series Type Base Extras AC-1 rating
QRC C7-W1x square Tungsten early make contact; Inrush current 2.5 ms 500 A 10 A 250 V AC
DIN CHI14 DIN17.5 mm W / AgSnO2 contact for high inrush currents up to 900 A 16 A 250 V AC
DIN CIM14 DIN17.5 mm W / AgSnO2 contact for high inrush currents up to 900 A 16 A 250 V AC
DIN RIC... DIN - 20...63 A 400 V AC
DIN RAC... DIN - 20...25 A 400 V AC
DIN RBC... DIN - 20...32 A 400 V AC

Safe separation of power circuits

Relays with increased contact distance of at least 3 mm allow safe separations in power circuits of high voltage currents and increase the protection degree from potentially lethal currents.

Suitable relays for this application

Series Type Base Gap Extras AC-1 rating
MRC C3-M1x round 2x 1.7 mm ≥ 3 mm Double make contacts; Blow out magnet 10 A 250 V AC
MRC C3-X1x round 2x 1.7 mm ≥ 3 mm Double make contacts 10 A 250 V AC
MRC C4-X2x square 2x 1.7 mm ≥ 3 mm Double make contacts 10 A 250 V AC
MRC C5-X1x square ≥ 3 mm Double make contacts 16 A 400 V AC
MRC C5-M1x square ≥ 3 mm Double make contacts; Blow out magnet 16 A 400 V AC
QRC C7-X1x square 2x 1.5 mm ≥ 3 mm Double make contacts 10 A 250 V AC

Reliable switching of low power signals

Twin contacts increase reliable switching by factors of 10 to 100 times. 10 µ hard gold plated contacts help to avoid contact oxidation. Together this allows reliable switching of very low level signals through the contacts. Low level voltages in analogue circuits and signal voltages <10V/5 mA are not easily able to overcome contact resistances. Twin contacts increase contact reliability and gold contacts avoid contact oxidations and are especially suitable to switch low power signal loads.

Suitable relays for this application

Series Type Base Extras Min. rating
MRC C2-T22x round Twin contacts, 10 µ gold plated 1 mA 5 V DC
MRC C3-T32x round Twin contacts, 10 µ gold plated 1 mA 5 V DC
QRC C7-T22x square Twin contacts, 10 µ gold plated 1 mA 5 V DC
QRC C7-H23 square 1 power & 1 signal contact 2 µgold plated 5 mA 5 V DC
QRC C9-A42x square Contacts, 10 µ gold plated 5 mA 5 V DC
IRC C10-T13x square Twin contacts, 3 µ gold plated 1 mA 5 V DC
IRC C12-A22x square Contacts, 3 µ gold plated 5 mA 5 V DC
IRC CSS-N square NPN Solide state 1 mA …48 V DC
IRC CSS-P square PNP Solide state 1 mA …48 V DC
 
Select the Right Relay for the Right Application
 
Efficient switching of high voltages high currents

Releco heavy duty relays are designed to switch high currents. Due to their relatively small dimensions and lower cost, these relays are more economical then contactors. Therefore control panels can be optimized for high power switching. Heavy duty relays save space in the panel and cost less than contactors. They can be used for switching higher currents, for example electrical heaters up to 16 A at 400 V AC.

Suitable relays for this application

Series Type Base Gap AC-1 rating
MRC C5-A2x square - 16 A 400 V AC
MRC C5-A3x square - 16 A 400 V AC
MRC C5-G3x square 1.7 mm 16 A 400 V AC
MRC C5-X1x square > 3 mm 16 A 400 V AC
QRC C7-A1x square - 16 A 250 V AC
RIC RIC20 DIN 17.5 mm - 20 A 400 V AC
RIC RIC25 DIN 35 mm - 25 A 400 V DC
RIC RIC40 DIN 54.5 mm - 40 A 400 V AC
RIC RIC63 DIN 54.5 mm - 63 A 400 V AC
RAC RAC20 DIN 17.5 mm - 20 A 400 V AC
RAC RAC25 DIN 34 mm - 25 A 400 V AC
RBC RBC20 DIN 18 mm - 20 A 400 V AC
RBC RBC32 DIN 35 mm - 32 A 400 V AC

Switching with a pulse

Change the ON/OFF status of a Comat latching relay (remanence relay) with a single pulse. The switching status remains stable also in the case of power failure. The switching status of a latching relay is changed with a single input pulse although permanent connection is also possible. The contacts remain in posi- tion even after the “on” coil is de-energized. This guarantees that the relay status remains in position until such time that a control signal is applied to the “off” coil. A stepping relay provides an alternative for pulse switching and latching. Latching relays help to save power dissipation, what is especially impontant when a hot environment is expected or when a high number of relays are mounted close with each other in a control cabinet.

Suitable relays for this application

Series Type Base Extras Max. contact rating
MRC C3-R2x round Remanence (Latching) relay 10 A 250 V AC
MRC C4-R3x square Remanence (Latching) relay 10 A 250 V AC
MRC C5-R2x square Remanence (Latching) relay 10 A 400 V AC
QRC C9-R2x square Remanence (Latching) relay 5 A 120 V AC
DIN RBC20 DIN 18 mm Bistable installation contactor 20 A 400 V AC
DIN RBC32 DIN 35 mm Bistable installation contactor 32 A 400 V AC

Max. life time and highest number of switching cycles

TURCK Comat Releco Long Life relays are relays of robust mechanical structure with 5 times longer life cycles compared to standard relays. Unlimited switching cycles are reached with solid state relays. The Long Life Relays with a more robust design provide a 5 times longer service life. Standard relays are designed for 10 to 20 million mechanical switching cycles. For periodical switching frequencies in the second or minute range, the standard relays reach their life cycle within a few months. The long life relays are specially designed for frequent switching applications.

Suitable relays for this application

Series Type Base Extras Max. contact rating
MRC C20C30 C21 round > 108 mechanical operations 10 A 250 V AC
MRC C20C30 C22 round > 108 mechanical operations, twin contacts 5 A 250 V AC
MRC C20C30 C31 round > 108 mechanical operations 10 A 250 V AC
MRC C20C30 C31 round > 108 mechanical operations, twin contacts 5 A 250 V AC
CSS CSS-I square Solid state AC (unlimited ops.) 3 A 250 V AC
CSS CSS-2 square Solid state AC (unlimited ops.) 3 A 250 V AC
CSS CSS-N square Solid state DC (unlimited ops.) NPN 6 A 48 V DC
CSS CSS-P square Solid state DC (unlimited ops.) PNP 6 A 48 V DC
CRINT CRINT-C1x5 DIN 6.2 mm Solid state DC (unlimited ops.) 2 A 24 V DC
CRINT CRINT-C1x8 DIN 6.2 mm Solid state AC (unlimited ops.) 1 A 240 V AC
DIN CMC1 DIN 14 mm Adjustable start and breaking ramps 16 A 24 V DC
DIN CMC15/16 DIN 14 mm Adjustable start and breaking ramps and speed 10 A 24 V DC

Blinking relays

Comat Releco blinking relays with integrated solid state outputs have a virtually unlimited life time independent from the switching cycles. Specially appropriate for blink- ing functions in intervals of seconds or minutes. Blinking in second or minute intervals with permanent repetitions wear standard mechanical relays in a short time. A standard relay will reach the limit of its designed life time within weeks or months. Special blinking relays with integrated semi conductor contacts provide the alternative for such applications.

Suitable relays for this application

Series Type Base Extras Max. contact rating
CIM CIM1 DIN 17.5 mm Time range adjustable 0.6 s - 60 h 16 A 250 V AC
CIM CIM2 DIN 17.5 mm Time range adjustable 0.6 s - 60 h 16 A 250 V AC
CIM CIM12 DIN 17.5 mm Time range adjustable 0.6 s - 60 h 2 A 250 V AC
CIM CIM22 DIN 17.5 mm Time range adjustable 0.6 s - 60 h 2 A 250 V AC
CIM CIM13 DIN 17.5 mm Time range adjustable 0.6 s - 60 h 5 A 30 V DC
CIM CIM23 DIN 17.5 mm Time range adjustable 0.6 s - 60 h 5 A 30 V DC
CIM CIM14 DIN 17.5 mm Time range adjustable 0.6 s - 60 h 16 A 250 V AC

Impulse shaping (Extending short pulses)

Pulse shaper of the series CPF extend or shorten input pulses for accurate further processing by PLC’s. PLC’s or other control circuits are often not able to process fast and short pulses. The pulses are conditioned with CPF pulse formers for further process- ing by PLC’s. Fast revolution speeds and distance measurements as well as “Namur” sensor signals are conditioned with the CPF type relays for further processing.

Suitable relays for this application

Series Type Base Trigger and Outputs times Max. contact rating
DIN CPF11 DIN 17.5 mm Input 1 - 5 ms; Output 5 - 60 ms 2 A 32 V DC
DIN CIM1x DIN 17.5 mm Input min. 20 ms; Output 50 ms - 60 h 16 A 250 V AC
DIN CIM2x DIN 17.5 mm Input min. 20 ms; Output 50 ms - 60 h 16 A 250 V AC
DIN CIM3x DIN 17.5 mm Input min. 20 ms; Output 50 ms - 60 h 16 A 250 V AC
DIN CM3 DIN 17.5 mm Input min. 35 ms; Output 50 ms - 60 h 5 A 250 V AC
DIN CRV4 DIN 13 mm Input min. 35 ms; Output 50 ms - 60 h 6 A 250 V AC
DIN CSV4 DIN 13 mm Input min. 20 ms; Output 8 ms - 10 h 1.5 A 24 V DC
CS CS2 round Input min. 50 ms; Output 50 ms - 60 h 8 A 250 V AC
CS CS3 round Input min. 50 ms; Output 50 ms - 60 h 6 A 250 V AC

Energy saving with the same switching capacity

Relays with sensitive coils have considerably less power consumption than standard relays. This allows up to 90% energy saving with practically identical switching capacity. Relays with sensitive coils have improved and more effective magnetic circuits than coils of standard relays. The result is a considerably reduced coil cur- rent compared to a standard relay but with an almost identical switching capacity per contact. This means lower power consumption and therefore more economical operating and less heat. Under some circumstances, the user can provide a smaller power supply and save costs.

Select the right relay for the right application

Series Type Base Sensitive coil AC-1 contact rating
MRC C3-N3x round Nominal power 900 mW 6 A 250 V AC
QRC C9-E2x square Nominal power 900 mW 5 A 250 V AC

Protection against aggressive environment

A 10 µ hard gold plating of the contacts is an effective way to protect the contacts against oxidation caused by aggressive gases. Aggressive gases may develop in sewage plants, chemical plants, or in the steel production. Conducting failures may occur on relays with standard silver nickel contacts because of contact surface oxidation. 10 µ hard gold plated contacts are especially suitable in such environments and improve the contact reliability.

Suitable relays for this application

Series Type Base Extras AC-1 contact rating
MRC C2-A28 round Contacts 10 µ gold plated 10 A 250 V AC
MRC C2-T22 round Twin contacts, 10 µ gold plated 6 A 250 V AC
MRC C3-A38 round Contacts 10 µ gold plated 10 A 250 V AC
MRC C3-T32 round Twin contacts, 10 µ gold plated 6 A 250 V AC
MRC C4-A48 round Contacts 10 µ gold plated 10 A 250 V AC
QRC C7-A28 square Contacts 10 µ gold plated 10 A 250 V AC
QRC C7-T22 square Twin contacts, 10 µ gold plated 6 A 250 V AC
QRC C9-A48 square Contacts 10 µ gold plated 5 A 250 V AC
IRC C10-A18 square Contacts 3 µ gold plated 10 A 250 V AC
IRC C10-T13 square Twin contacts, 3 µ gold plated 6 A 250 V AC
IRC C12-A22 square Contacts 3 µ gold plated 5 A 250 V AC
IRC C12-G22 square Twin contacts, 3 µ gold plated 5 A 250 V AC

Relays according to Railway standard (increased shock and vibration resistance)

Relays as per Railway standard EN50155/EN60077/EN61373 are more suitable for applications with shock and vibration and have a higher degree of surge protection. Many of these railway relays also comply to additional fire protection standards, have lower inflammability and develop less toxic smoke and gases in case of fire. Relays specially developed to comply with railway standards are designed for higher vibration, shock and surge values and allow higher tolerance in the voltage supply. Some of these relays additionally comply to special fire protection standards in regard to inflammability and the development of toxic smoke and gases in fire accidents. Although specially designed for railway applications these relays are also suitable for other industrial applications where increased product safety is required.

Suitable relays for this application

Series Type Base Railway standard Max. contact rating
LongLife C31 round EN 50155, Fire protection NF F16-101/102 10 A 250 V AC
LongLife C32 round EN 50155, Fire protection NF F16-101/102 6 A 250 V AC
QRC R7-A2x square EN 60077-1-2/99, EN 61373/99 10 A 250 V AC
QRC R7-T2x square EN 60077-1-2/99, EN 61373/99 6 A 250 V AC
CIM CIM1R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 16 A 250 V AC
CIM CIM12R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 2 A 250 V AC
CIM CIM13R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 5 A 30 V DC
CIM CIM2R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 16 A 250 V AC
CIM CIM22R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 2 A 250 V AC
CIM CIM23R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 5 A 30 V DC
CIM CIM3R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 16 A 250 V AC
CIM CIM32R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 2 A 250 V AC
CIM CIM33R DIN 17.5 mm EN 50155, Fire protection NF F16-101/102 5 A 30 V DC
RIC RIC20 DIN 17.5 mm EN 50155 20 A 400 V AC
RIC RIC25 DIN 35 mm EN 50155 25 A 400 V AC
RIC RIC-AUX DIN 8 mm EN 50155 6 A 400 V AC