Product Catalog Standard Switches & Sensors

General technical information

Code of Conduct

The self declared Code of Conduct is very important for Marquardt. It describes the basic rules of the ethical and legal behavior among each other, but also with business partners, public authorities and other third parties. Please contact us for more details.


Almost all Marquardt switches have been tested in accordance with EN 61058-1 or IEC 61058-1 and designed for the application conditions specified therein unless specified otherwise. They carry the uniform European approval mark ENEC. The approvals for the USA and Canada are granted in accordance with UL 1054, on request also already in accordance with UL 61058 3rd ed. or CSA 61058. In the year 2015 all approvals according UL 1054 und CSA 22.2 No. 55 expire and will be replaced by the UL 61058. Marquardt started with the conversion and re-evaluation for a smooth process for our customers already. The end device approval requirements for the target market China changed by middle of 2010. Switches must not be CCC certified generally, but the freely CQC approval simplifies the end device approval. CQC approvals are available for some standard switches. Please contact us for more details and support. Please see the catalog for the respective granted approvals. A list of the approved Marquardt products can be found on the web pages of the respective test bodies (e.g. VDE, KEMA, UL and CSA). We will provide the appropriate certificate on request.

Approval marks

cCSAus    Canada with confirmation of the national US requirements
cULusUSA with confirmation of the national Canadian requirements
CQCfreely Chinese approval mark

Approval marks specified in the series overview are product- dependent. That means that the products are assignable in the tables based on the rating specifications (black print − Europe / blue print − North America). The exact assignment of the approval marks are specified on the customer drawing for each product. The drawings are available as download from the online product catalog.

CE mark / Declaration of installation

The CE mark is an identification according to EU law for certain products with regard to the product safety. It is not a seal of quality (quality mark). By attaching the CE mark, the manufacturer confirms that the product complies with valid European regulations. The CE mark does not mean that the product has been checked for compliance with regulations by an independent body.

Following revisions of the EU regulations in 2007 some of our switches have no labeling obligation, some are subject to the low voltage directive and some are subject to the machine directive. The CE mark and the issuing of the declaration of conformity depend on the respective situation.

A CE mark is not prescribed for the components but for the smallest packing unit.

RoHS (Restriction of the Use of Certain Hazardous Substances)

From July 1, 2006 no more new electrical and electronic products may be offered in the EU which do not comply with the RoHS directive. The use of lead, mercury, hexavalent chromium, cadmium and the flame inhibitors containing bromide PBB and PBDE is prohibited for the protection of man and the environment.

Compliance with the legal regulations is a matter of principle for Marquardt.

This means all necessary measures for the implementation of the RoHS guideline have been done already, including suppliers. In our products are no forbidden materials included restricted by RoHS (lead, cadmium, chrome (VI), mercury and polybrominated flame retardant) anymore. The exception is the integrated printed circuit board (PCB) of the product series 3230.

As far as we know and based on the information available to us from our suppliers, the products presented in this catalog meet the requirements of the EU Directive 2011/65/EU (Edition 1.7.2011).

REACH (EG/1907/2006)

REACH stands for Registration, Evaluation, Authorization and Restriction of Chemicals.

Marquardt is anxious to develop and produce all products in compliance with applicable regulations, including the REACH regulations. Please contact us for more information.

Household Appliances Standard IEC/EN 60335

Various switches in the Marquardt product portfolio are conform with the Household Appliance Standard IEC/ EN 60335-1:2001/2002, chapter 30. These switches are identified by a “G” in the specification or drawing and on the label of the smallest packing unit. Materials are used here which comply with the values for the glow-wire-flammability index (GWFI) and the glow-wire-ignition-temperature (GWIT) demanded by the standard. The appropriate switches are labeled in the catalog in the product tables of the individual series. The appropriate certificate with the confirmation of conformity is available on request.

Rating for alternating current voltage (AC)

The electrical reference values, i.e. the maximum permissible electrical loads in continuous operation, are specified for the respective switch series. Most Marquardt switches are suitable for ohmic resistance load and motor load.

In the specification of the reference power using the bracket notation, e.g. 16 (4) A 250 V AC, the value in front of the brackets indicates the switch-off current and the value in brackets the nominal motor current. In switches which are additionally approved by test bodies in the USA (UL) and Canada (CSA) the corresponding ratings according to North American standards are listed additionally in blue. The motor loads may also be shown as HP (Horse Power) values according to North American conventions.

Rating for direct current voltage (DC)

Since the range of DC loads is very wide and extensive and also depends very greatly on the application, no DC values are specified for the majority of the series in this catalog. Explicit tests are recommended for this. Tests which have already been carried out are available on request and the results can be used as references. As a rule of thumb it can be assumed at low currents that the specified alternating current values (AC) correspond to the direct current values when the life is reduced to about one third. In series with DC voltage specifications the specified current always refers to an ohmic load. If inductive or capacitive loads are available, the application must be checked by tests with the original load.

Life endurance

The mechanical life endurance is the number of possible switching cycles without electrical loading of the contacts whilst the electrical life endurance is determined with the permissible rated electrical power for the contacts. The lower the electrical load is, the closer the electrical life is to the mechanical life when using the switch in the appliance.

Gold-plated contacts

For applications with a rating of < 300 mW or < 12 V we recommend switches with gold-plated contacts, also for applications with rare actuation or in a sulfurous atmosphere or other corrosive environments. Minimum currents are not especially defined, but can be assumed in a range down to 1 mA.

Switching frequency

For switches which are expected to be actuated more than 2 000 times a year, the test bodies prescribe an electrical life endurance of > 50 000 switching cycles. The majority of our switches meets these requirements and is marked by the 5E4 symbol (50 000 switching cycles) as an additional specification in the rating data. Switches without specification of the switching cycles in the rating data are approved for a switching frequency of 10 000 cycles. These data refer to the load which is typical for and described in the IEC 61058-1 standard. For clear differing, e.g. slower or faster actuations, we will be glad to advise you!

Contact distance

The majority of our appliance switches and some of our snap-action switches have a contact distance which enables full disconnection from the mains. The opening distances are even more than 3 mm in most cases. Switches which are not suitable for full disconnection are marked with the μ symbol.

The switch standard IEC 61058-1 demands a contact distance of > 1.5 mm, the Household Appliances Standard EN60335 < 3 mm depending on the application for full mains disconnection. In switch variants with < 3 mm the test bodies usually acknowledge the mains plug or a disconnection device in the installation as a disconnection from the mains. Ask your test body if in doubt.

Proof tracking

The proof tracking (PTI/CTI value) indicates at what voltage the proof tracking test is passed. The tracking distance is the shortest distance along the surface of the insulating material between two conductive parts. The values specified in the catalogue correspond to the division according to EN 61058-1 or IEC 61058-1.

Inrush current

Short capacitive peak currents mainly occur when switching devices with power supply units (e.g. computers, printers, fax machines, etc.). The duration of these currents is typically < 10 ms. The test conditions with a special test circuit are defined in EN 61058-1 or IEC 61058-1.

Values of the possible capacitive inrush currents are available for most of our appliance switches. They are labeled with the specification of the continuous current and the maximum inrush current as well as the voltage, e.g. 5/100 A 250 V AC.

Guideline for the inductive inrush current is 6 times of the specified motor current described in brackets (e.g. 24 A at 12(4) A). Please contact us in case of doubt.

Ambient temperature

The designation of the permissible ambient temperature with e.g. T 85 means that the switch can be used for a maximum ambient temperature of 85 °C according to the test criteria of the European safety standards (EN 61058 or IEC 61058-1). The identification T85/55 indicates that the terminal side of the switch is suitable for an ambient temperature of 85 °C, whilst the actuating part (e.g. rocker) is subject to the room temperature of 55 °C demanded by the standard. Using the switches outside the permissible temperature range and in a very humid or corrosive atmosphere can impair the functional capability.

For UL-approved switches, the ambient temperature is determined by the RTI (Relative Temperature Index) of the used materials. Generally, the permissible ambient temperature of polyamides is 65 °C. Switches for higher ambient temperatures are available on request.

Ambient conditions

The ambient conditions must be considered for the individual application completely. For our switch the use of vapors, glue, silicon etc. should be avoided, because it can change the contact resistance negatively. Aggressive liquids, salts and strong durable UV light can influence or damage the surfaces.

Isolation characteristics

Devices have to be developed and constructed in a way that they work safely for conventional use. To work in a safe way an adequate isolation is needed in order to protect against the danger of current.

The measurements of this insulation is based on a protection target which also has an adequate protection against electric shocks even if there is an facile fault. This includes a protection against direct and indirect contact. This target can be achieved

  • by so called “Basis Insulation” and the connection of all metal parts, which can have dangerous touch voltage in case of failure, with the protective conductor of the passed conduct, of the building installation like they are made in appliances with protection class I.
  • by Basis Insulation and additional insulation (double insulation) in appliances with protection class II
  • Enforced insulation likewise in appliances with protection class II

Most Marquardt switches are constructed for appliances with protection class II, which means that they can be used without additional safety measures for all other appliances independent from protection class (cf. DIN en 61058-1, Kap. annotation). If there are deviant characteristics they are observed in the specification.

The necessary testing voltage to appoint the electric strength in regard of the over voltage category II and a pollution degree II is defined in IEC 60664.

  • Basis Insulation 1500 V
  • Additional Insulation 1500 V
  • Enforced Insulation 3000 V

This means that the switches are tested and is proven that they are able to allow an adequate protection.

Please consider the allowance for the current appliance standards of the application which include different allowances unlike this general rules.

Storage conditions

The delivered products must be stored in the original Marquardt packaging in a temperature range between 5 and 45 °C and 30 to 75 % relative humidity. The storage time of 12 months may not be exceeded. Storage in different containers and different climates may impair the properties of the product.
Products with solder terminals can be stored under the following conditions:

  • Temperatures between 5 °C and 40 °C
  • Mean relative humidity below 50 % (relative humidity max. 85 %)
  • No condensation and sulfurous environments

We recommend to check the processing results of the solder terminals in case of different storage conditions or when exceeding a storage time of more than 6 months.

Soldering conditions

1. Recommended handling instructions for leadfree hand soldering
The basis for the solderability of the products in this catalog in the as-delivered state is DIN IEC 60068-2-20.

We recommend:

Soldering devices
electronically controlled soldering station with the typical power consumption of 50 - 80 VA

flux-filled solder wire, flux type 1.2.2

Solder temperature
350 °C ±10 °C (setting on the appliance)

Soldering time
2 to 3 s

No force may be applied to the switch terminals during soldering, otherwise the switch properties (operating position etc.) could be changed. Longer soldering times and multiple soldering can impair the mechanical properties of the solder point and adjacent areas.

When using flux, make sure that no flux gets inside the switch via the terminals. In such cases, the switch may not be soldered “upside down”, i.e. with the terminals on top.

In open switching systems the soldering fumes must be kept away from the switch by suitable means.

2. Recommended handling instructions for leadfree wave soldering
Soldering profiles are published in DIN IEC 61760 which must be adapted to the respective modules and the production conditions.

Typical and maximum values:

duration 80 s typical at 110 °C, max. 125 °C

Wave soldering
duration 2 - 7 s at 235 °C, Tmax. 245 °C

Gradient pre-heating
max. 2 °C/s

Gradient cooling
max. -4 °C/s

These notes are guidelines which must be adapted respectively to the concrete process.

IP protection

The IP protection according to DIN EN 61058-1 and IEC 60529 specified in our documents refers to the actuating side of the switch unless stated otherwise. The customer must provide the seal between the switch and customer appliance and test for leaks at this point.

EMC (electromagnetic compatibility)

Marquardt switches for use in appliances meet the requirements for interference emissions in accordance with EN 61058-1 when they are used according to our specifications. Requirements for interference suppression in the appliances can be found in the appliance or EMC specifications.

Appliance safety law

If you need to observe the valid German appliance safety law, we recommend to use switches which have been tested and approved according to the specifications EN 61058-1 or VDE 0630. Switches without approval marks must be tested by the approval body in connection with your appliance.

Terminal symbols

Contact resistance

The contact resistance is the electrical resistance which can be measured at the switch terminals with closed contacts. The data refers to unwired contacts in new condition with a typical measuring current of greater than 100 mA. For silver-based contact materials this value is below 100 mΩ (measuring current 1 A at 12 V DC), for gold-based contact materials below 50 mΩ.

Switching functions