3RT1 contactors/3RH1 control relays 3.4 Accessories Accessories for frame size S00 The accessories for contactors that switch motors and for control relays are of the same type. The accessories are attached at the front. Accessories for frame sizes S0 to S3 The accessories are (with few exceptions) the same for frame sizes S0 to S3. They can be attached in different ways: • Auxiliary switches can be attached at the front or the side. • Surge suppressors can be attached at the top or the bottom.
3RT1 contactors/3RH1 control relays The following graphic shows you the accessories for the control relays and contactor relays for auxiliary circuits of frame size S00: 3 4 12 5 1 6 13 7 8 2 9 14 10 11 16 NSB00066a 15 Fig.
RT1 contactors/3RH1 control relays The following graphic shows you the accessories for the contactors of frame sizes S0 to S3: 4 5 17 20 11 18 21 10 16 2 12 1 14 1 6 9 15 7 19 8 16 20 13 21 22 3 NSB00449 23 Fig.
3RT1 contactors/3RH1 control relays The following graphic shows you the accessories for the contactors of frame sizes S6 to S12: 9 12 11 13 8 1 10 14 3 1 4 15 5 6 11 NSB01157b 7 Fig. 3-38: Accessories for contactors of frame size S6 to S12 1 Air-break contactors 3RT10 and 3RT14, frame size S6, S10 and S12 3 4 5 6 7 8 Auxiliary contact blocks, solid state time-delay (on- or off-delay or wye-delta function) 4-pole auxiliary contact block (terminal markings in acc.
3RT1 contactors/3RH1 control relays 3.4.1 Attachable auxiliary switches for extending the auxiliary contacts Integrated auxiliary contacts Frame size S00 The contactors of frame size S00 have an auxiliary contact integrated in the basic unit. Frame size S0 to S3 The contactors of frame sizes S0 to S3 do not have an integrated auxiliary contact in the basic unit.
3RT1 contactors/3RH1 control relays Electronically optimized auxiliary switch blocks The electronically optimized auxiliary switch blocks contain enclosed switching elements that are particularly suitable for switching low voltages and currents (hard gold-plated contacts) as well as for use in dusty atmospheres. The rated operational current is Ie/AC-14 and DC-13: 1 to 300 mA, voltage: 3 to 60 V.
3RT1 contactors/3RH1 control relays The following table shows you the expansion options for the different frame sizes: Frame size Auxiliary switch block Connection S00 1, 3 and 4-pole (attachable at the front) Screw-type/Cage Clamp terminal Feeder auxiliary switch (attachable at the front): • 1-pole (1 NO or 1 NC contact) • 2-pole (1 NO + 1 NC or 2 NO contacts) Infeed from above or below possible Screw-type terminal 1, and 4-pole (attachable at the front) 2-pole (attachable at the side) Screw-type/
3RT1 contactors/3RH1 control relays Auxiliary switches at side (S0 to S12) The auxiliary switches are hooked onto the left or right side of the contactor and snapped onto it. They are removed again by pressing the ribbed surfaces. 1 1 2 1 2 2 1 Fig. 3-40: Side mount auxiliary contacts Note When you use two 2-pole, side mount auxiliary contacts, you must attach an auxiliary switch block on the left and right in the interests of symmetry.
3RT1 contactors/3RH1 control relays Frame sizes S6 to S12 (3RT10/3RT12/3RT14) Operation type Contactor type at operational range listed below 0.8 x USmin 0.85 x USmin conventional 3RT1...-.A Air-break contactors 3RT10/14 8, of which 4 NC max. 9, of which max 6 NC Vacuum contactors 3RT12 8, of which 4 NC max. 8, of which max 6 NC electronic 3RT1...-.N Air-break/Vacuum contactors 8, of which 4 NC max. with RLT 3RT1...-.P/Q Air-break contactors 3RT10/14 8, of which 4 NC max.
3RT1 contactors/3RH1 control relays Switching of the auxiliary contact elements With the standard type of auxiliary switch, when the contactors are switched on, first the NC contacts are opened and then the NO contacts are closed. On Contactor Off NC Standard auxiliary switch On Off Off NO On Fig.
3RT1 contactors/3RH1 control relays 3.4.1.1 Terminal markings of the contactors frame sizes S00 to S12 In contactors of frame size S00 with an integrated auxiliary contact, the terminal marking complies with EN 50 012.
3RT1 contactors/3RH1 control relays Auxiliary contacts S00 The following graphic shows you the auxiliary contacts that can be used to expand the contactors of frame size S00 (terminal marking in acc. with EN 50 012 or EN 50 005): contactors, DIN EN 50 012, 1 auxiliary contact identification no. 01 auxiliary switch blocks, 4, 3 or 1 contact(s) auxiliary switch blocks, 4 or 2 contacts identification no. 32E, 23E, 22E, 11E identification no.
3RT1 contactors/3RH1 control relays The following graphic shows you the front mount auxiliary contacts that can be used to expand the contactors of frame sizes S0 to S3 (terminal marking in acc. with EN 50 005 or EN 50 012): 4-pole auxiliary contact blocks 1-pole aux. contact blocks contactors 3RT10 2. 3RT10 3. 3RT10 4. without auxiliary contact contactors 3RT10 2. 3RT10 3. 3RT10 4. without auxiliary contact auxiliary switch blocks, with 4 contacts 3RH19 21-. HA.. in acc.
3RT1 contactors/3RH1 control relays DIN EN 50 012/ DIN EN 50 011 For certain equipment such as auxiliary contact elements of contactors and control relays, the EN 50 012 and EN 50 011 standards also apply. The EN 50 012 defines the terminal markings and identification numbers for auxiliary contact elements of particular contactors. The terminal markings of the auxiliary contact elements match the terminal markings of corresponding control relays with the ID letter E (in acc. with EN 50 011).
3RT1 contactors/3RH1 control relays 3.4.1.3 Auxiliary switches that can be attached to 3RH1 control relays The 3RH1 control relays can be expanded by up to 4 contacts using attachable auxiliary switch blocks. Definition: DIN EN 50 011 The main standard for the designation of switching elements for the control relays is EN 50 011, which defines the terminal markings, identification numbers, and identification letters of certain control relays using a specific sequence of the switching elements.
3RT1 contactors/3RH1 control relays Contact designation Auxiliary switch blocks - for example, 3RH1911-1GA22 (2 NO + 2 NC contacts) in acc. with EN 50 011 - can only be attached to control relays with 4 NO contacts (3RH1140-.....) because they are coded. The identification number (62E) printed on the auxiliary switch block (6 NO + 2 NC contacts) applies to the whole contactor. NO and NC contacts are in the same position on all the control relays with the identification number 62E (DIN EN 50 011).
3RT1 contactors/3RH1 control relays The following device circuit diagrams of the control relays contain terminal markings in acc.
3RT1 contactors/3RH1 control relays 3.4.
3RT1 contactors/3RH1 control relays Important The time-delay auxiliary switch cannot be added to contactor relays. Installation/removal Caution Switch off the supply voltage to A1/A2 before you install or remove the timedelay auxiliary switch block. The time-delay auxiliary switch is attached to the front of the contactor. 3RT1.1 1 2 Fig.
3RT1 contactors/3RH1 control relays 3.4.2.2 Frame sizes S0 to S12 (3RT1926-2E, -2F, -2G) Description The time-delay auxiliary switch for frame sizes S0 to S12 has the following features: • The power supply of the time-delay auxiliary switch is via two terminals (A1/A2). • The time delay for the time-delay auxiliary switch can be activated by parallel connection to any contactor coil, or by any source of voltage. • The off-delay version works without an auxiliary supply. • The minimum on-time is 200 ms.
3RT1 contactors/3RH1 control relays Function diagrams NSK-7932 A1/A2 27/28 35/36 On-delay 1 NO and 1 NC contact t > 200 ms A1/A2 Off-delay without auxiliary supply 1 NO and 1 NC contact NSK-7933a 27/28 35/36 t NSK-7955 A1/A2 Y 27/28 D 37/38 t 50 ms Wye-delta function 1 NO contact, instantaneous 1 NO contact, delayed Fig. 3-53: Time-delay auxiliary switches, function diagrams (frame sizes S0 to S3) 3.4.
3RT1 contactors/3RH1 control relays Notes on configuration The control of loads parallel to the start input is not permissible in AC operation. See the relevant circuit diagram ¿ below. The off-delay solid-state time relay blocks (3RT1916-2D.../3RT1926-2D...) have a live start input (B1). With AC voltage, this can imitate the control of a parallel load on the B1 terminal. In this case, an additional load (contactor K3, for example) should be wired as shown in circuit diagram À.
3RT1 contactors/3RH1 control relays Connection When the solid-state time relay block is installed, it is connected at the same time with the A1 and A2 coil connections of the contactor by the plugin pins. Coil connections of the contactor that are not required are covered by covers on the housing of the time relay block, thus preventing inadvertent connection.
3RT1 contactors/3RH1 control relays 3RT19 26-2C... on-delay Frame size S0 to S3 3RT19 26-2D... off-delay (with auxiliary supply voltage) Frame size S0 to S3 L1/L+ A1 A2 A1 A2 1 NSB00556 L1/L+ A1 B1 A2 1 2 A1 S1 NSB00557 Circuit diagrams A1 A2 A1 A2 2 A2 N/L N/L A2 can either be connected to the contactor or the timing relay with N(L-). - - - connect as preferred A2 may only be connected with N(L-) from the timing relay x do not connect! ¿ time relay block À contactor Fig.
3RT1 contactors/3RH1 control relays Technical specifications Rated voltage AC 50/60 Hz 180 V to 255 V Rated output power 1.65 W at 230 V Permissible contactor types 3RT1.1 3RT1. Associated coil type P0 (230 V, 50/60 Hz) N2 (220 V, 50/60 Hz) P6 (220 V, 50 Hz/240 V, 60 Hz) Operating range 0.8 to 1.1 Us Installation The additional load is connected in parallel to the contactor coil.
3RT1 contactors/3RH1 control relays Conductor cross-sections The permissible conductor cross-sections correspond to the auxiliary conductor terminals of the corresponding frame size. Circuit diagram Coupling link 3RH19 24-1GP11 for control from a PLC L1 B1+ B2- N K1 U U A1 K2 K1 Coupling link K2 Contactor A2 B1+/B2-: Control voltage 24 VDC L1/N: Rated control supply voltage for the selected contactor Fig.
3RT1 contactors/3RH1 control relays 3.4.6 Surge suppression When contactor coils are de-energized, overvoltage occurs (inductive load). Voltage peaks of up to 4 kV with a rate of rise in voltage of 1 kV/ms can result (showering arcs). The consequences of this are: • Heavy contact erosion and thus premature wearing of the contacts that switch the coil • Unwanted signals can occur that may cause false signals in electronic controllers.
3RT1 contactors/3RH1 control relays Varistor Circuit with a varistor (AC/DC operation) USp [V] USp 200 0 0 20 t [μs] Fig. 3-64: Circuit with a varistor (AC/DC operation) This is what happens when a coil is de-energized that is connected to a varistor (voltage-dependent resistor): Voltage peaks still occur. They are cut off at approximately 400 V and have a shorter overall duration (approximately 50 µs). (Note: The oscillogram is cut off, and the voltage is reduced to zero after approximately 3 ms.
3RT1 contactors/3RH1 control relays Diode Circuit with diode (DC operation) USp [V] USp 20 = 0,6 V ^ = USP of the Diode 0 0 200 t [μs] Fig. 3-66: Circuit with a diode (AC/DC operation) This is what happens when a coil is de-energized that is connected to a diode: Advantages: No overvoltage occurs during de-energization. The diode block becomes effective at 0.6 V. Disadvantage: The diode can only be used for DC operation.
3RT1 contactors/3RH1 control relays Selection aid The following table gives you a comparison of the effects of the different surge suppressors: Suitable for control supply voltage Surge suppressor Overvoltage is limited Suppression diode/ freewheeling diode DC 0.
3RT1 contactors/3RH1 control relays Installation Frame size S00 The surge suppressor is attached on the front of the contactors. There is space next to the attached auxiliary switch block. The direction of attachment is defined by a code. Frame size S0 to S3 2 Varistors, RC elements, and diode combinations can either be inserted and snapped on from above or below directly onto the coil terminals.
3RT1 contactors/3RH1 control relays 3.4.7 Other accessories 3.4.7.1 LED module for indicating contactor control (3RT1926-1QT00) Description The LED module can be connected to the coil terminals of the contactors of frame sizes S0 to S3. It indicates the status of the contactors by means of yellow LEDs. Mode of operation The LED module can be used for AC/DC voltages of 24 V to 240 V. The LEDs are connected bidirectionally to protect against polarity reversal.
3RT1 contactors/3RH1 control relays 3.4.7.3 Box terminal blocks Main cable connections Other than the 3RT1054 (55 kW/400 V/AC-3), that can optionally come with the box terminal block 3RT1955-4G, the S6 to S12 contactors come with busbar connection. For the direct connection of round cables or ribbon cable box terminal blocks (as accessories) can be used for frame sizes S6 to S12.
3RT1 contactors/3RH1 control relays Description The connection of the main conducting path to the EMC suppression module reduces the contact sparking that is responsible for contact erosion and many of the disturbances, which in turn supports an EMC-compatible configuration. Mode of operation The EMC suppression module reduces through 3 phases the radio-frequency parts and the voltage peaks.
3RT1 contactors/3RH1 control relays RC circuit The RC circuit is suitable: • For reducing the rate of rise • In RF damping Effective suppression can be achieved for a wide range of applications. Varistor circuit A varistor circuit can absorb a high level of energy and can be used for frequencies from 10 to 400 Hz (stabilized drives). There is no limit below the buckling stress. 3.4.7.5 Soldering pin adapter for frame size S00 (3RT19 16-4KA.
3RT1 contactors/3RH1 control relays Removing the spring If necessary, the spring for attachment to the rail can be removed before the soldering pin connection is mounted. 1 2 Fig.
3RT1 contactors/3RH1 control relays 3.4.7.6 Paralleling links (3RT19 .6-4B.31) If the current paths of a multiple pole switching device are connected in parallel, then the total current is spread over the individual poles in accordance to their ohmic resistance and their mutual inductive interference. The ohmic resistance is mainly made up of the contact resistance of the contacts, whose value can change with erosion and oxidation.
3RT1 contactors/3RH1 control relays The following designs of Paralleling links are available: Designs Frame sizes Design S00 to S3 3-pole, without connection terminal (wye jumper)2) S00 to S3 3-pole, with connection terminal S00 4-pole, with connection terminal S6 to S12 3-pole, with through hole Table 3-44: Paralleling links: designs 2) Installation 3.4.7.7 accessory for wye-delta combinations The paralleling links each be shortened a pole. Sealing cover (3RT19 .
3RT1 contactors/3RH1 control relays 3.4.7.8 Terminal covers for frame sizes S2 to S12 To increase safety there are terminal covers available for contactors with frame sizes S2 to S12: Design Function required number Frame sizes Cover for box terminals 3RT19.6-4EA2 provides additional protection against shock S2 to S12 Terminal cover for ring-tongue and busbar connection 3RT19.
3RT1 contactors/3RH1 control relays The following graphics show how to install the covers Installation Drawing 3RT1956-4EA2 3TX7500-0A 3 2 5 Procedure Frame size 3RT19.6-4EA2 S2 to S12 The terminal covers for the box terminals are pushed into the guides on the box terminals block then slid toward the back until it locks into place. 1/ 4 3RT19.
3RT1 contactors/3RH1 control relays 3 3RT1966-4EA3 3 3RT19.6-4EA3 Slide the cover in the guides on the contactor. With S10 and S12: before installation shorten the cover 3RT1966-4EA3 (it serves at the same time as an adapter for the terminal cover 3RT1966-4EA1 with contactor combinations) S6 to S12 1 2x 2 Fig.
