Overload Relays 3RB2 Solid-State Overload Relays Footnotes for page 25: 1) Please observe operational voltage. 4) Contactor cannot be mounted. 3) U e = 500 V. 2) Type of coordination and short-circuit protective devices acc. to IEC 60947-4-1: Type of coordination "1": The contactor or the starter may be non-opera- tional after every short-circuit release. Type of coordination "2": The contactor or the starter must be operatio- nal after a release (without replacement of parts). There is a risk of contact welding. 5) Please ensure that the maximum AC-3 operational current has sufficient safety clearance from the rated current of the fuses. 6) With 3UF18 68-3GA00 current transformer.
24 Siemens · 2009 3RB20, 3RB21 for standard applications Type Size Width 3RB20 16, 3RB21 13 3RB20 26, 3RB21 23 3RB20 36, 3RB21 33 3RB20 46, 3RB21 43 3RB20 56, 3RB21 53 3RB20 66, 3RB21 63 S00 S0 S2 S3 S6 S10/S12 45 mm 45 mm 55 mm 70 mm 120 mm 145 mm Auxiliary circuit Number of NO contacts 1 Number of NC contacts 1 Auxiliary contacts – assignment 1 NO for the signal "tripped", 1 NC for disconnecting the contactor Rated insulation voltage Ui V (degree of pollution 3) 300 Rated impulse withstand voltage Uimp kV 4 Auxiliary contacts – contact rating • NC contact with alternating current AC-14/AC-15 Rated operational current I e at Ue:
- 24 V A - 120 V A - 125 V A - 250 V A • NO contact with alternating current AC-14/AC-15: Rated operational current I e at Ue: - 24 V A - 120 V A - 125 V A - 250 V A • NC, NO contact with direct current DC-13: Rated operational current I e at Ue:
- 24 V A - 60 V A - 110 V A - 125 V A - 250 V A • Conventional thermal current I th A • Contact reliability (suitability for PLC control; 17 V, 5 mA) 4 4 4 3 4 4 4 3 2 0.55 0.3 0.3 0.11 5 Yes Short-circuit protection • With fuse, gL/gG operational class A 6 Ground-fault protection (only 3RB21) • Tripping value I Δ • Operating range I • Response time ttrip (in steady-state condition) s The information refers to sinusoidal residual currents at 50/60 Hz > 0.75 × I motor Lower current setting value Integrated electrical remote reset (only 3RB21) Connecting terminals A3, A4 24 V DC, 100 mA, 2.4 W short-term Protective separation between main and auxiliary con- V ducting path acc.
to IEC 60947-1 300 CSA, UL, UR rated data Auxiliary circuit – switching capacity B300, R300 Connection of the auxiliary circuit Connection type • Terminal screw • Tightening torque Nm • Conductor cross-sections (min./max.), 1 or 2 conductors - Solid mm2 - Finely stranded without end sleeve mm2 - Finely stranded with end sleeve mm2 - Stranded mm2 - AWG cables, solid or stranded AWG Screw terminals Pozidriv size 2 0.8 ... 1.2 1 × (0.5 ... 4), 2 × (0.5 ... 2.5) – 1 × (0.5 ... 2.5), 2 × (0.5 ... 1.5) – 2 × (20 ...
14) Connection type • Conductor cross-sections (min./max.), 1 or 2 conductors - Solid mm2 - Finely stranded without end sleeve mm2 - Finely stranded with end sleeve mm2 - Stranded mm2 - AWG cables, solid or stranded AWG Spring-type terminals 2 × (0.25 ... 1.5) -- 2 × (0.25 ... 1.5) 2 × (0.25 ... 1.5) 2 × (24 ... 16)