3RT2016-2MB41-0KT0

The M-shaped coil is a 24V DC wide-range design, capable of stable engagement even with a voltage of 0.85~1.85 times the rated value. It has built-in diode protection, and this coil version is supplied in the market with the part number suffix "-0KT0".

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The 3RT2016-2MB41-0KT0 belongs to the Siemens SIRIUS "M" coil version. It also features 24V DC power supply, a built-in diode, and a wide operating voltage range (it can engage normally within 0.85 to 1.85 times the rated value). The main circuit maintains the common specifications of the S00 housing and AC-3 9A/4kW/400V, with one normally open (NO) auxiliary contact. It's worth noting that this M coil version is consistently circulated in European distributor catalogs under two complete part numbers: "-2MB41-0KT0" (1 normally open) and "-2MB42-0KT0" (1 normally closed). In other words, "-0KT0" is the standard suffix for this M coil contactor, not an optional add-on. We have not found a publicly available word-for-word definition of this suffix code from Siemens during our investigations; therefore, we are simply recording the fact that it consistently appears with the M coil version without further speculation. In practical selection, the 2MB41 is fully compatible with the main circuit of the 24V DC coil versions of the same size, such as the 2VB41 and 2BB41. It can be selected based on the existing habit of using the exact coil model on site or the consideration of spare parts interchangeability.

Core Product Advantages and Features
Wide coil voltage range
It can stably engage within a voltage range of 0.85 to 1.85 times the rated voltage, making it suitable for environments with large fluctuations in power supply voltage.
Built-in diode protection
The coil has a built-in diode to absorb the back electromotive force at the moment of power failure, reducing electrical interference to the control circuit.
1 set of normally open auxiliary contacts
It can be used as a signal source for operational status feedback or indication circuits to meet basic interlocking requirements.
Spring-loaded terminal design
Both the main circuit and auxiliary contacts are spring-clamp type, and can be used with 0.5~4mm² wires simply by plugging and unplugging, without the need for screws.
project Specification
Main circuit structure 3-pole normally open (3NO) is suitable for direct starting of three-phase motors.
AC-3 Rated Current/Power 9 A / 4 kW (400V)
Maximum rated operating voltage 690V AC 50/60Hz
Case size S00 (45 mm wide x 70 mm high x 73 mm deep, consistent across all versions)
Mechanical life Approximately 30 million cycles.
Installation method 35mm standard DIN rail mounting
Auxiliary contact type 1 NO (Normal Open)
Coil voltage/type 24V DC, wide-range coil (0.85~1.85 times Us), built-in diode
Terminal type Cage clamp type, wire 0.5~4mm²/AWG 20~12
Part Number Suffix Explanation "-0KT0" is a standard part number suffix for the commercially available M-coil version; its exact definition is not found in Siemens' public documentation.
Protection level IP20
Compliant with regulations RoHS compliant