The 54 mm width across 3 width units means it occupies three 18 mm module positions on a DIN rail — plan your rail fill accordingly.
Siemens 5TT5742-2 SENTRON Insta Contactor, 40 A, 24 VAC/DC C
MPN5TT5742-2
Siemens SENTRON 5TT5742-2 insta contactor, 2 NO + 2 NC contacts, 40 A rated current, 230/400 VAC operating voltage, 24 VAC/DC actuation, IP20, 3 width units.
Source DocumentedChannel stated on listing & quote
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Width | 54 mm |
| Height | 90 mm |
| Depth | 71 mm |
Product details
Frequently asked questions
What are the key dimensions for panel layout?
Depth is 71 mm (installation depth 64 mm), width is 54 mm (3 width units at 18 mm each), height is 90 mm. It snaps onto a 35 mm DIN rail per the standard SENTRON mounting.
What coil voltage does this contactor use?
The actuation coil is rated for 24 VAC/DC. It accepts either AC or DC control voltage, which simplifies wiring in mixed-control panels.
What is the contact configuration?
It has 2 normally open (NO) contacts and 2 normally closed (NC) contacts, giving you four total poles for load switching or auxiliary signaling.
What compliance or standards does it carry?
The part is designated per DIN EN 61346-2 and DIN EN 81346-2 function codes (Q for switching devices). IP20 protection class is listed. Standard SENTRON documentation covers RoHS and CE compliance for EU markets.
MPN
5TT5742-2