Publication 1747-UM011G-EN-P - June 2008
Selecting Contact Protection
Inductive load devices such as motor starters and solenoids may 
require the use of some type of surge suppression to protect the 
controller output contacts. Switching inductive loads without surge 
suppression can significantly reduce the lifetime of relay contacts.
Surge Suppression for Inductive Load Devices
These surge suppression circuits connect directly across the load 
device. This reduces arcing of the output contacts. (High transient can 
cause arcing that occurs when switching off an inductive device.) 
Bulletin 700 Type R Relay
Bulletin 700 Type RM Relay
12V dc 199-FSMA9
Bulletin 700 Type R Relay
Bulletin 700 Type RM Relay
24V dc 199-FSMA9
Bulletin 700 Type R Relay
Bulletin 700 Type RM Relay
48V dc 199-FSMA9
Bulletin 700 Type R Relay
Bulletin 700 Type RM Relay
115-125V dc 199-FSM10
Bulletin 700 Type R Relay
Bulletin 700 Type RM Relay
230-250V dc 199-FSMA11
Bulletin 700 Type N, P, or PK Relay 150V max, ac or dc
700-N24
(2)
Miscellaneous electromagnetic 
devices limited to 35 sealed VA
150V max, ac or dc
700-N24
(2)
(1)
Varistor
(2)
RC Type – Damage could occur with SLC 500 triac outputs if you use suppressors having RC networks and the 
load current is 15 mA or less.
Devices Requiring Surge Suppression
+ -
Surge Suppression for Inductive ac Load Devices
Output Device
Varistor
Output Device
RC Network
Surge Suppression for Inductive DC Load Devices
Output Device
Diode (A surge suppressor can also be used.)
Contact protection methods for inductive ac and DC output devices.
Output Device
Surge 
SuppressorIndramat TDM 3.2-030-300-W1
Indramat DDS02.1-W050-D
Indramat 025B-0-ZS-3-E/040-B-1
Indramat CLM 01.3-X-0-2-0 
Indramat KVR 1.3-30-3
Indramat TVD 1.2-15-03
Phoenix Interbus-S IBS RT 24 DIO 16/16-T
Phoenix Contact Interbus-S IBS S5 DCB/I-T
Phoenix Interbus-S IBS RT 24 AIO 4/2-T
Phoenix Contact Interbus-S IBS S5 DCB/I-T
Phoenix Interbus-S IBS RT 24 DI 32-T
Phoenix Interbus-S IBS RT 24 DI 16-T
Phoenix Interbus IBS CT 24 I/O GT-LK
Phoenix Interbus PSM-EG-RS232/TTY-P/2K
Phoenix IBS STTB ZF 24 BK-LK
Phoenix Interbus IB ST ZF 24 DO32/2
Heidenhain Typ: 359 002-05 359002-05
Heidenhain Typ: 324 952-12 Id.Nr. 32495-12
Heidenhain Typ: 324 952-03 Id.Nr. 324955-15
Heidenhain Rechner TNC 320/TNC 320 11

1756-STRT4HW  1756-STRT4HW  1756-STRT4HW

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