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Siemens 3RB12 Instructions Manual

Solid-state overload relay
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3RB12
Elektronisches Überlastrelais
Solid-state overload relay
Relais de surcharge electronique
Relé electronico di sobrecarga
Relè elettronico di sovraccarica
Elektroniska överlastrelä
Betriebsanleitung
Instructions
Bestell-Nr./Order No.: 3ZX1012-0RB12-1AA1
Ausgabe/Edition 01/2003
GWA 4NEB 631 2282-30a

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  Summary of Contents for Siemens 3RB12

  • Page 1 3RB12 Elektronisches Überlastrelais Solid-state overload relay Relais de surcharge electronique Relé electronico di sobrecarga Relè elettronico di sovraccarica Elektroniska överlastrelä Betriebsanleitung Instructions Bestell-Nr./Order No.: 3ZX1012-0RB12-1AA1 Ausgabe/Edition 01/2003 GWA 4NEB 631 2282-30a...
  • Page 2 127,5 ∅ 4,5 3RB1246-1P 3RB1246-1E 3RB1246-1Q - - - - - - 3ZX1012-0RB12-1AA1...
  • Page 3 3RB1253- 3RB1257- 3RB1262- ∅ 7 ∅ 9 ∅ 11 - - - - - - - - - i d b 3ZX1012-0RB12-1AA1...
  • Page 4 3RB12 3ZX1012-0RB12-1AA1...
  • Page 5 05 07 L1 L2 L3 Test/ Reset ⇑ CLASS 5, 10, 15, 20, 25, 30 K2 Ground ϑ Fault ⇑ 3 RB 12 3RB12 Ground K1 Overload Fault Ready Ground Overload Fault T1 T2 T3 06 08 Automatic- Remote- Reset Reset ϑ...
  • Page 6 3RB12..-...0 3RB12..-...2 T2/C1 J - - Gnd Fault AC 220-240V Reset 3RB12 Ready Gnd Fault Overload Test/ Reset Class G/9401 3RB1246-1EM00 Overload Gnd Fault 3ZX1012-0RB12-1AA1...
  • Page 7 3RB12..-...1 3RB12..-...3 T2/C1 ϑ ↑ ↑ Gnd Fault AC 220-240V Reset 3RB12 Ready Gnd Fault Overload Test/ Reset Class G/9401 3RB1246-1EM00 Tripped OVL-Warning 3ZX1012-0RB12-1AA1...
  • Page 8 3ZX1012-0RB12-1AA1...
  • Page 9 AND BURNS. DISCONNECT POWER BEFORE PROCEEDING WITH ANY WORK ON THIS EQUIPMENT. Device description The 3RB12 electronic overload relay protects electrical equipment, such as three-phase AC motors and trans- formers, with three different protection mechanisms. Overload The 3RB12 compares the motor current actually...
  • Page 10 Installation Installation For dimension drawings, see graphics section, Fig. I and II. Mounting position: any Mounting of 70 mm devices: ■ Snap-on mounting on 35 mm mounting rail in con- formity with EN 50 022 or ■ srew mounting by means of inserted lugs as accessory (3RB1900-0B).
  • Page 11 = 1.5 A Protection of If single-phase AC motors are to be protected by the single-phase 3RB12 solid-state overload relay, phase L must be motors looped through the device. The main circuits must be connected as shown in Fig. III.
  • Page 12 Connection 3.1.2 Current range 50 A to 820 A Busbar connection: see graphics section, Fig. II Finely stranded Stranded con- Connection Tightening conductor with ductor with screws torque termination cable lug cable lug [Nm/lb.in] [mm x mm] 3RB1253 35 to 95 50 to 120 10 to 14 / 20 x 4...
  • Page 13 Operation Operation Setting the current ■ Use the current setting range knob to set the appropriate current. Adjust tripping classes Note The motor, leads and contactor must be rated for the appropriate class. Class 10 as delivered. ■ Check the class setting before initial start-up and correct it if necessary! ■...
  • Page 14 Ready LED: Monostable version of device: for operation Dark 95/96, 05/06 open control voltage 97/98, 07/08 closed failure Bistable version of device: Switching statuses are retained Five minutes after overload tripping, the 3RB12 can be reset to operating mode. 3ZX1012-0RB12-1AA1...
  • Page 15 Operation Test Statuses after the Test/Reset button has been pressed: Test Status Without With main current main current* button O.k. Faulty O.k. Faulty Press for LED Ready up to 2 s LED Gen. Fault LED Overload Status of auxiliary unchanged switching elements Press for LED Ready...
  • Page 16 The test with a test time of less than 5 s can be per- formed during operation. In a fault-free state the outputs remain unchanged. Reset When the Reset the overload relay after the following times by 3RB12 has briefly pressing Remote reset automatic-reset tripped because the test / reset...
  • Page 17 Technical data Technical data Specifications DIN VDE 0660 Part 102 / IEC 60947-4-1, DIN VDE 0660 Part 200 / IEC 60947-5-1, UL 508, CSA C 22.2 Pulse packets (burst), IEC 61000-4-4 2 kV Discharge of static electricity, IEC 61000-4-2 8 kV Radiated high-frequency fields, IEC 61000-4-3 3 V/m Surge voltage, IEC 61000-4-5...
  • Page 18 Technical data Short-circuit Main circuit protection Short-circuit protection with fuses for motor feeders with short-circuit currents up to 50 kA at 690 V, 50/60 Hz (see data given in catalog) Control circuit Fuse links, duty class gL/gG 6 A quick-acting 10 A Protective circuit-breaker 1.6 A C characteristic...
  • Page 19 Risque d’électrocution et de brûlure. Isoler cet appareil du réseau avant d’y intervenir pour travaux. Description de l'appareil Le relais électronique de surcharge 3RB12 dispose de différents mécanismes de protection pour les matériels électriques tels que moteurs triphasés et transforma- teurs.