The product standard only contains minimum requirements. Attention is drawn to the fact that appliance specifications might contain requirements additional to or deviating from those specified in the relevant product standards.

Please be aware that the specifications nominal value used in the German part of the Schurter catalogue and the data sheets, is synonymous with rated value.

The difference between these two values is a pure matter of definition. In order to avoid any unnecessary complications we will continue to use the specifications nominal value.

CE marking is the only marking which indicates that a product conforms to the relevant EU-directive.

This means that the CE-mark is no quality or standard conformity mark but only an administration mark.

SCHURTER products are covered by the low voltage directives 72/23/EEC and 93/68/EEC. Those are valid for equipment and appliances with rated voltage values between AC 50 V to AC 1000 V as well as DC 75 V to DC 1500 V.

The CE marking of SCHURTER parts will be found on the label of the smallest packing unit. On request we will submitt a CE conformity statement for each component. CE conformity statements and approvals can also be retrieved from the internet under www.schurter.com.

National testing institutions are testing according to national and international standards or other generally recognized rules of technology. Their certification/approval-marks confirm the observance of the safety requirements which electric appliances must fulfil.

Approvals

National approvals

In addition to the combined UL/CSA approvals, most of the SCHURTER components are also approved by one of the European certification bodies like VDE (Germany), Electrosuisse (Switzerland) or SEMKO (Sweden). The safety testing of all these European certification bodies are based on the commen European safety standards. With the harmonisation effort in Europe, the different national European certification bodies have lost their importance and SCHURTER has decided to maintain only one European approval (e.g. VDE, SEV or SEMKO) in future. The others will not be renewed once they have expired.

Because UL and CSA are not members of the CENELEC, the standards of UL and CSA are not harmonised yet with the European standards. However, UL and CSA are trying to harmonize their standards with each other. Where possible, SCHURTER will apply for the combined cULus or cURus approval.

Further to development in Asia, SCHURTER has obtained national approvals from China, Japan and Korea.

Information about approvals

SCHURTER products are certified according to EN / IEC standards and carry country specific approvals in Europe.

During the last few years European countries made much effort to reduce their approval marks to one generally accepted mark. The ENEC approval mark replaces (wherever possible) the previous approval mark. The ENEC mark is offered by all national certification bodies that signed for the European certification agreement (CCA)*.

SCHURTER decided to reduce the variety of European approval marks. For new approbations of SCHURTER parts only the ENEC will be mentioned in the future:

Approvals for the US and Canada are according to the UL and CSA standards:

As UL and CSA are not a member of CENELEC these two are not according to the European approval marks. Wherever possible SCHURTER want to acquire the combined cULus approval mark:

Since Aug. 1^st. 2003 the Chinese approval mark is required for a lot of products to import to China. SCHURTER strives to get the approvals for the concerned products. For not testable products we offer an import certificate (free of CCC).

Further information:

http://www.enec.com

Approval Industry Links

* members of ENEC agreement:

Standards IEC 60529; EN 60529 and DIN 40050

Scope

These standards apply to the classification of degrees of protection provided by enclosures for electrical equipment with a rated voltage not exceeding 72.5 kV.

Object

The object of these standards is to give:

a) Definitions for degrees of protection provided by enclosures of electrical equipment as regards:

1. Protection of persons against access to hazardous parts inside the enclosure

2. Protection of the equipment inside the enclosure against ingress of solid foreign objects

3. Protection of the equipment inside the enclosure against harmful effects due to the ingress of water.

b) Designations for these degrees of protection.

c) Requirements for each designation.

d) Tests to be performed to verify that the enclosure meets the requirements of these standards.

Designations

The degree of protection provided by an enclosure is indicated by the IP code.

Elements of the IP code and their meanings

A brief description of the IP code elements is given in the following table.

1. Protection against direct and indirect contact – general terms

The protection against electric shock on electric equipment as well as their components are divided into the following parts:

¹⁾ Accessible, conductive part, which is not conductive normally but which may be conductive due to a failure.

2. Protection against direct contact with live parts e.g. of a fuseholder

The data sheets of the relevant components inform about the taken measures.

3. Protection against indirect contact

Measures for the protection against indirect contact on electrical equipment are defined according to IEC 61140 by the 4 protection classes 0, I, II, III. Each protection class includes two protection measures. Even if one of these measures should fail, no electric shocks will occur.

Input Systems METAL LINE

Various designs and materials, SCHURTER offers a wide range of possible designs and materials in order to create an ideal input system matching your individual requirements.

According to requirements and fields of application the switches and keypads are available with various housing materials.

The ideal material for rough environments is high quality stainless steel* with resistant surface. Especially for piezo switches, aluminium or flameproof unbreakable plastic versions are available.

For the mechanical switches, SCHURTER offers housings made of aluminium or diecasted zinc with nickel-plated surface in addition to stainless steel.

For external applications we certainly recommend resistant materials such as stainless steel or aluminum. An additional finish for the keypads is possible with a glass-bead coating.

* Stainless steel surfaces may have slight differences in colour as a result of different batches of preliminary materials.

The surfaces of the input systems can be finished according to customer requirements.

Varnishing of switches and keypads in various signal colours is possible. Additional inscriptions are sealed by transparent lacquer. The aluminium housings of the switches can be delivered in various anodised colours. Colouring of the switches using powder coating is available on request.

With a wide variety of shapes and sizes a broad range of standard solutions can be offered.

Keypads are available with round or rectangular actuators. The size of the switch surface is variable up to a diameter of 35 mm.

Piezo switches with a minimum mounting diameter of 16 mm can be adapted in shape and size to customer requirements. Adaptations for integration into individual layouts are also available at short notice.

Depending on the application and font, there are various lettering possibilities.

Switches and PC keypads are laser-lettered as standard. For special applications, the lettering can also be etched or engraved with a coloured background.

PC keypads with German, British or U.S. layouts are usually laser-lettered. Further country-specific letterings are available on request ex works.

The following standards can be used for key letterings:

Order idex lettering

Standard colours for lettering

Lettering PSE / MCS / MSM:

PSE M16 indicator

PSE M16, M19, M24/27/30 RI

PSE M22 Non-illuminated / Point illuminated

MCS 19 Non-illuminated / Point illuminated, MCS 30 Ring illuminated

MSM 16

MSM 19 Non-illuminated / Point illuminated

MSM 22 Non-illuminated / Point illuminated

MSM 30 Non-illuminated / Point illuminated

According to customer requirements, SCHURTER also offers complete function units. The switches or keypads are individually installed in the specific front panel. SCHURTER additionally offers completely assembled system solutions for integration of further components and electronic modules. An example is the desktop version for metallic panel keypads: the input system is installed in a desktop housing with integral trackball for mouse control.

For applications in cold climatic environments, the metallic panel keypads can be additionally provided with a heating overlay. For this reason, the keypad is still pleasant to use even at frosty temperatures and the freezing of the switches is prevented.

1. Point illumination

SCHURTER offers the standard colours red, green, yellow, blue as well as bi-coloured red/green for the point illumination of the switches. Point illuminations in other colours are available on request.

Data of standard LEDs

2. Ring illumination

This design is homogeneous and available in red, green, yellow, blue and bi-coloured red/green as standard colours. Ring illuminations in other colours are also possible.

Data of standard LEDs

Characteristics for connection:

Supply voltage: 24 VDC

F un ctional Description Piezo Switch NO

The piezo switch is based on the functional principle of the piezoelectric crystal. The action of force on the piezo disc causes a voltage to be induced due to a charge transfer. The voltage generated is converted by the electronic connection into a polarity-neutral, electronic switch contact.

During the voltage drop, the electronic switch contact is closed for the specified pulse duration. After this, the electronic switch contact opens again, even if the force is still present. The period that the electronic switch contact remains closed depends on the actuating speed and force as well as on the duration of actuation.

Diagram of a NO switch:

The piezo disc is connected to the terminals 1 and 2. The electric circuit to be switched is connected at the terminals 3 and 4. This can be either direct voltage (DC) or alternating voltage (AC). If a pulse is applied to the piezo disc, terminal 1 becomes positive in relation to terminal 2 due to the voltage generated. The integrated switching element controls the electric circuit to be switched.

In the neutral position of the piezo switching element, the terminals 3 and 4 are non-conductive, and initial switch resistance is > 10 MOhm. When the piezo disc is actuated, the initial switch resistance is reduced to < 20 Ohm.

When actuating the piezo disc, the resistance between terminals 3 and 4 is therefore changed from high resistance → low resistance → high resistance.

This corresponds in principle to the function of a conventional NO pushbutton switch.

Fun ctional Description Piezo Switches Illumination

Ring Illumination

Single or bi-colored ring illumination is possible for the PSE switches.

When equipped with two colors, it is possible to either switch between the colors or to achieve a combination color, depending on the type of activation.

For example: Diodes of group 1 = red and diodes of group 2 = green

Only group 1 is activated → Ring has red illumination

Only group 2 is activated → Ring has green illumination

Both groups are activated at the same time → Ring has orange illumination

Red cable = Supply voltage: red LEDs

Green cable = Supply voltage: green LEDs

Black cable = Minus for all LEDs

White cable = Switch contact

Terminal layout:

Ring Illumination for M24, M27, M30 series - 12 / 24 VDC

Ring Illumination for M22 series - 12 / 24 VDC with Wires

Ring Illumination for M22 series - 12 / 24 VDC with Plug Connector

Ring Illumination Special Type 5 VDC - on request

P oint Illumination

When illuminating the PSE switch, either a single-color LED (2 pins) is used or a bi-colored LED (3 pins). If a single-color LED is used, cable No. 2 is not needed (see terminal layout).

Switching between colors can be achieved by appropriate activation.

Terminal layout:

Point Illumination

Annotation for the Protection of Piezo Switch PSE EX

The explosion-proof piezo switch PSE EX has the function of a NO switch (normally open / NO).

The permissible voltage and current of the PSE EX switch are limited, so that the PSE EX is intrinsically safe in accordance with EN60079-11.

The electrical characteristics are listed under Specifications.

The use of the PSE is therefore permitted only in areas where the formation of explosive atmospheres caused by gases, fumes, mist or dust mixing with air occurs occasionally.

The PSE EX has a high degree of security that is also effective at common equipment malfunctions or errors.

The explosion-proof PSE is classified according to EN 60079-0 in the device group II, category 2.

Please note:

- The permissible operating temperature is -20°C to +60°C.

- Operation approval expires on removal of the type label.

- Installation in accordance with IEC / EN 60079-14 and IEC / EN 60079-25.

1. Decoder

The metallic panel keypads are designed with an XY matrix. The PC keypads are available with a corresponding keypad decoder and can therefore be used as standard in German, British and U.S. versions. Further country-specific programming can be realised according to customer requirements ex works.

2. Interfaces

Depending on the version, AT PS/2 or USB connections are available as ports with mini-DIN or USB connectors.

3. Connecting technology

Depending on the design, the switches are available with quick connect terminals, flexible wires, pins or clip for pins. Plug-compatible adapters are available for the MCS 19 to achieve rational wiring of components.

4. Switching options

High capacity with the SCHURTER power card: the small design of the piezo switches only allows the switching of small signals or powers in general. With the SCHURTER power card, which is connected directly to the piezo switches, large powers can also be switched. The relays on the SCHURTER power card allow higher voltages, currents and powers to be used and significantly extend the range of applications of the piezo switches.

Increased ease of use is offered for the piezo switches by the prolonged signal version from SCHURTER. Piezo switches usually have a short closing pulse which depends on the activating force, duration and speed. For the piezo switches with prolonged signal, the signal is passed on for the duration in which the switch is pressed (max. 50 seconds).

Protection against pyroelectric effects for the piezo switches with prolonged signal is provided by a specially developed circuit which compensates any pyroelectric effects resulting from the occurrence of large changes in temperature. The switches with integral temperature compensation are of course tested for functional safety by using specific individual tests.

The input systems of the SCHURTER metal line are protected against external mechanical use. The degree of protection is stated in IK values according to DIN EN 50102.

Overview Approvals for MSM / MSM DP / MSM CS

Overview Approvals for MSM LA

Overview Approvals for PSE NO / PSE IV

Overview Approvals for PSE EX

Overview Approvals for PSE HI

according to DIN 50021-SS

(24h, 48h and 96h residence time)

MSM S witches

The surface of the stainless steel material is covered with a molecular-passive layer. Only under very unfavourable conditions it is possible, that iron and rust molecules as well as base metals penetrate the passive layer as foreign substances (pollutions) and initiate the rust process.

The smoothness of the actuator was not affected. After the residence time the tested samples were cleaned under running water and all rust spots could be removed.

MCS Switches

The salt spray test is only valid for the actuating element and not for the complete switch.

- Stainless steel version:

The surface of the stainless steel material is covered with a molecular-passiv layer. Only under very unfavourable conditions, it is possible that iron and rust molecules as well as base metals penetrate the passive layer as foreign substances (pollutions) and initiate the rust process.

The actuation of the switch was not affected. After the residence time the tested samples were cleaned under running water and all rust spots could be removed.

- Zinc die-cast with nickel plating version:

The surface of the zinc die-casting version shows no signs of corrosion.

PSE Switches

After 8h the start of corrosion may be discerned; after 96h this corrosion has spread across large areas of the switch.

This surface corrosion may be removed under running water.

The PSE switches PSE NO and PSE IV meet the requirements for food processing equipment:

DGUV test certificate FW 11 040

As housing material, stainless steel is recommended for use in food processing equipment.

At the final equipment, the installation position for switches with anodized aluminum housing may not be located above the food area.

Testing on qualification according to DIN EN 81-71 safety measures against vandalism destruction in people- and freight elevators

The switches pass stress class 1 and 2.