Overload Relays 3RB2 Solid-State Overload Relays 3RB20, 3RB21 for standard applications Technical specifications 1) On request. 3) 90 % for relay with current setting range 160 ... 630 A. 2) S0 for 6 ... 25 A, CLASS 20, I emax = 19 A; S0 for 6 ... 25 A, CLASS 30, I emax = 16 A. 4) Terminal compartment: degree of protection IP00. 5) Signaling contact 97/98 in position "tripped": 4/11 g /ms.
21 Siemens · 2009 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 General data Trips in the event of Overload, phase failure, and phase unbalance + ground fault (for 3RB21 only) Trip class acc. to IEC 60947-4-1 CLASS 10/20/5, 10, 20 and 30 adjustable (depending on the version) Phase failure sensitivity Yes Overload warning No Reset and recovery • Reset options after tripping • Recovery time - For automatic RESET min. - For manual RESET min. - For remote RESET min. Manual, automatic and remote RESET (depending on the version) Approx.
3 min Immediately Immediately Features • Display of operating state on device • TEST function • RESET button • STOP button Yes, by means of switch position indicator slide Yes, test of electronics by pressing the TEST button / test of auxiliary contacts and wiring of control circuit by actuating the switch position indicator slide / self-monitoring Yes No Explosion protection – safe operation of motors with "increased safety" type of protection EC type test certificate number acc.
to directive 94/9/EC (ATEX) PTB 06 ATEX 3001 II (2) GD Ambient temperatures • Storage/transport °C • Operation °C • Temperature compensation °C • Permissible rated current at - Temperature inside control cabinet 60 °C, % stand-alone installation - Temperature inside control cabinet 60 °C, % mounted on contactor - Temperature inside control cabinet 70 °C % -40 ... +80 -25 ... +60 +60 100 1002) 100 100 100 100 or 903) 100 1002) 100 100 70 70 1) Repeat terminals • Coil repeat terminal • Auxiliary contact repeat terminal Yes Not required Yes Not required Degree of protection acc. to IEC 60529 IP20 IP204) Touch protection acc.
to IEC 61140 Finger-safe Finger-safe, for busbar connection with cover Finger-safe with cover Shock resistance with sine acc. to IEC 60068-2-27 g/ms 15/115) Electromagnetic compatibility (EMC) – Interference immunity • Conductor-related interference - Burst acc. to IEC 61000-4-4 kV (corresponds to degree of severity 3) - Surge acc. to IEC 61000-4-5 kV (corresponds to degree of severity 3) • Electrostatic discharge acc. to IEC 61000-4-2 kV (corresponds to degree of severity 3) • Field-related interference acc.
to IEC 61000-4-3 V/m (corresponds to degree of severity 3) 2 (power ports), 1 (signal ports) 2 (line to earth), 1 (line to line) 8 (air discharge), 6 (contact discharge) 10 Electromagnetic compatibility (EMC) – Emitted interference Degree of severity B acc. to EN 55011 (CISPR 11) and EN 55022 (CISPR 22) Resistance to extreme climates – air humidity % 100 Dimensions See dimensional drawings Installation altitude above sea level m Up to 2000 Mounting position Any Type of mounting Direct mounting/stand-alone installation with terminal bra- cket Direct mounting/stand-alone installation