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Siemens SIRIUS 3RU User Manual
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Circuit diagrams
12.4
3RB
21 internal circuit
diagrams
SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic ov
erload relays
Manual
,
0
9/
2016
,
A5E03656507420A/
RS
-
AB/003
157
12.4
3RB21 internal circuit diagrams
Internal circuit diagrams for 3RB21
3RB215
3
Figure
12
-8
3RB21, S
6 electro
nic overload
relay
3RB216
3
Figure
12
-9
3RB21, S
10
/ S12 el
ectronic o
verload rela
y
156
158
Table of Contents
Default Chapter
5
Table of Contents
5
1 Introduction
9
Responsibility of the User for System Configuration and Functionality
9
Purpose of the Manual
9
Advantages through Energy Efficiency
10
Required Basic Knowledge
10
Scope of the Manual
10
Siemens Industry Online Support
11
Further Documentation
12
Datamatrix Code
13
Siemens Industry Online Support App
13
Recycling and Disposal
14
Technical Assistance
14
2 Standards
15
3 Product Description
17
Introduction
17
Versions
19
Applications
21
3RU21 Thermal Overload Relays
23
3RB20 Electronic Overload Relays
28
3RB21 Electronic Overload Relays
32
3RB30 Solid-State Overload Relays
36
3RB31 Solid-State Overload Relays
41
4 Product Combinations
47
5 Functions
49
Protection against Overload, Phase Failure, and Phase Asymmetry
49
Functional Principle
49
Inverse-Time Delayed Overload Release
50
Tripping Classes
50
Tripping Characteristics
51
Ground-Fault Protection in the Case of 3RB21 / 3RB31
54
Auxiliary Contacts
55
Indication of the Operating State
56
Self-Monitoring (3RB20 / 3RB21 and 3RB30 / 3RB31 Only)
56
Additional Functions
57
6 Configuration
59
SIRIUS System Configurator
59
Overload Relays in Motor Feeders
60
Motor Protection with Overload Relay
60
Overview of Combinable 3RT Contactors
61
Normal and Heavy-Duty Starting
62
Contactor Assembly for Star-Delta (Wye-Delta) Start
63
Operation with Frequency Converters
64
Short-Circuit Protection
65
Protecting Explosion-Protected Motors
66
Safety Instructions for Use in Hazardous Areas (3RB)
67
General Information
67
Installation and Commissioning
69
Safety Data
74
Maintenance and Repair
75
Warranty
75
Further Information
75
Application Environment
76
7 Mounting
81
Mounting Options
81
Minimum Clearances and Mounting Position
82
Mounting/Disassembly
83
Thermal and Electronic Overload Relays (S00 / S0)
83
Thermal and Electronic Overload Relays (S2 / S3)
88
Electronic Overload Relays (S6)
90
Solid State Overload Relays (S10 / S12)
95
8 Connection
99
Connection of 3RU21 Overload Relay
102
Connection of 3RB20 / 3RB21 and 3RB30 / 3RB31 Overload Relays
102
Connection Cross-Sections
103
Conductor Cross-Sections for Screw-Type Connection Systems
103
Conductor Cross-Sections for Spring-Loaded Connection Systems
110
Conductor Cross-Sections for Ring Cable Lug Connection System
112
9 Operation
115
Setting the Current
115
Setting the Tripping Class/Ground-Fault Detection (3RB21 / 3RB31)
116
RESET after Release
117
TEST Function
120
Response of the Auxiliary Contacts
121
10 Accessories
123
Terminal Support for Stand-Alone Assembly
124
Description
124
Mounting/Disassembly
125
Mechanical Remote RESET
129
Release Slide
129
Description
129
Mounting/Disassembly
130
Cable Release
131
Description
131
Mounting/Disassembly
132
Module for Electrical Remote RESET (3RU21 Only)
134
Description
134
Connecting Remote Reset
134
Mounting/Disassembly
135
Sealable Cover
136
Description
136
Mounting
137
Covers for Ring Cable Lug Connections
139
Description
139
Terminal Cover for Cable Lug Connection and Busbar Connection
140
Description
140
Mounting
141
Terminal Covers for Box Terminal Block
142
Description
142
Mounting
142
Box Terminal Block
143
Description
143
Mounting
144
11 Technical Data
147
Technical Data in Siemens Industry Online Support
147
Overview Tables
148
Performance Features
148
General Data
148
Protection Functions - Overview
149
Equipment
150
Features of Overload Relays
151
12 Circuit Diagrams
153
Cax Data
153
Internal Circuit Diagrams 3RU2
154
3RB20 Internal Circuit Diagrams
156
3RB21 Internal Circuit Diagrams
157
Internal Circuit Diagrams 3RB30
158
Internal Circuit Diagrams 3RB31
160
Wiring Examples
162
Types of Coordination
165
References
167
Manuals - SIRIUS Modular System
168
More Information
170
Dimension Drawings (Dimensions in MM)
171
Cax Data
171
Dimension Drawings for 3RU21 Thermal Overload Relays
172
Dimension Drawings for 3RB20 / 3RB21 Electronic Overload Relay
180
Dimension Drawings for 3RB30/3RB31 Electronic Overload Relays
182
Drilling Diagram for 3RT Contactors
194
Dimension Drawings and Drilling Plan for 3RU29.6 Stand-Alone Assembly Supports
198
Index
203
4
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Siemens SIRIUS 3RU Specifications
General
Brand
Siemens
Model
SIRIUS 3RU
Category
Control Unit
Language
English
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