[introduction]The first circuit that we once had made may include an a batteries, lamp and a switch, close when switch, the light is bright; Disconnect when switch, the lamp destroys. We realise switch designs medium action in the electron so namely. When the design, the function of affirmatory switch, wants switch kind and need rated electricity and voltage, it is the key of optimal switch type selecting. The article discusses the focal point the slip switch that uses in compact design. Target application asks to exceed small-sized and slip switch to have compact dimension and compressed appearance, such ability use high density printed circuit board (PC board) realize close together pile.

The first circuit that we once had made may include an a batteries, lamp and a switch, close when switch, the light is bright; Disconnect when switch, the lamp destroys. We realise switch designs medium action in the electron so namely. When the design, the function of affirmatory switch, wants switch kind and need rated electricity and voltage, it is the key of optimal switch type selecting. The article discusses the focal point the slip switch that uses in compact design. Target application asks to exceed small-sized and slip switch to have compact dimension and compressed appearance, such ability use high density printed circuit board (PC board) realize close together pile.

To satisfy these requirements, the SS series of NKK Switches exceeds small-sized and slip switch to apply to use logic n and low power switch to satisfy the application of these requirements. This series dimension is compact, include coping and flank to send use design version. This series has a variety of configuration to be able to offer an alternative, every kinds of configuration can provide smooth movement, strict pawl operation and stronger contact stability. Before detailed knowledge, let us review the fundamental of slip switch first.

The fundamental of slip switch

Like most switch type, the main component inside slip switch crust is identical, the fixed contact that includes to join the movable contact of communal terminal and join output terminal (graph 1) .

Graph 1: The interior that shows the series that it is SS to exceed small-sized and slip switch simplifies view. (picture origin: NKK Switches)

Slip switch orgnaization includes to use contact. Slide on the any in moving contact to be able to secure contact in two. In SS series switch, NKK Switches uses slip double rail (STC) contact, offer the contact orgnaization with reliable height. Switch operation is smooth, feel is ringing, pawl action is positive, contact stability is taller. Move contact and fixed contact to intersect into right angle, reduced the area that contacts a dot thereby, make osculatory resistor more stable. Double beam clips fixed contact, provided contact redundant, raised dependability thereby. Send every time move constantly, brush a movement to be met oneself clean switch contact.

Extremely number, cast number and position

Switch is according to its pilot circuit is counted and the contact number of every circuit undertakes discriminating (graph 2) .

Graph 2: The circuit join of every position in 3 kinds of common switch explains. (picture origin: NKK Switches)

Extremely number is the circuit amount that points to switch control. Extremely odd (SP) switch can dominate a circuit only. Ambipolar (the circuit that DP) switch control becomes independent twice. Every can have extremely output link that switch cast number described switch is counted. The SS series of NKK Switches has SP and DP two kinds of configuration, double cast (DT) or 3 cast (3T) join.

Exceed small-sized SS series slip switch give typical examples

Such SPDT of NKK Switches SS12SDP2 slides switch has a communal terminal and two output terminal (graph 3) .

Graph 3: SS12SDP2 has 3 outside terminal and two slip places. The terminal among is communal terminal (cite a base 2) , on the right side of (1) and left (3) it is two output terminal cites a base. (picture origin: NKK Switches)

For example, this SPDT switch has a sheet pole and two different switch to output a choice.

Consult graph 2 medium SPDT go, when slide block is in buy of right side position, communal terminal (among cite a base 2) with on the right side of output (cite a base 1) join. Same, when slide block is in left position (like the graph 3 are shown) , public end and left output (cite a base 3) join.

Contact sequential is the order that points to contact of adjacent of photograph of slide block join. SS12SDP2 is after closing first, leave (MBB) or short circuit contact switch. When slide block changes the position, communal bring foot and output to cite a base brief join. Sequential of another kind of contact is after leaving first, close (BBM) or contact of blame short circuit switch. The slide block in BBM switch won’t join when switch output terminal. If SPDT opens conjunction to receive the public line between source of two different voltage, need to use BBM switch to prevent short circuit.

The rated power level of SS12SDP2 is as high as 100 MA to electric current falls in the voltage that is as high as 30 VDC. When 0.4 VA of power level prep above, osculatory surface is silver-gilt, and formulary contact resistor is 20 M Ω or smaller.

SS12SDP2 is the design is very compact exceed small-sized and slip switch (graph 4) .

Graph 4: SS12SDP2 is special at 0.1 In. Aperture bar. (picture origin: NKK Switches)

Switch dimension is 0.402 In. (10.2 Mm) grows X 0.157 In. (4 Mm) wide X 0.177 In. (4.5 Mm) is tall. Call its exceed small-sized switch, solid return to the name. Contact brings crural span to be 0.100 In. (2.54 Mm) , suit this kind of common circuit the reseau layout of board aperture.

The SS22SDH4 of NKK Switches is slip switch of a kind of DPDT, use orthogonal installation, because this blade is located in switch noumenal flank, the side that be called uses switch (graph 5) .

Graph 5: SS22SDH4 is orthogonal DPDT exceeds small-sized and slip switch, have two communal terminal, and every communal terminal has two output contact. (picture origin: NKK Switches)

Consult graph 2 medium DPDT go, DP switch has two communal terminal, every communal terminal has two possible output link. Like SS12SDP2, SS22SDH4 also is MBB switch.

SS22SDH4 can issue processing in 28 V AC or DC voltage the logistic n of low power comsumption under 0.4 VA. Operation of n of logic of this kind of low power calls weak power circuitry; Contact won’t produce electric arc when disconnect below this kind of low voltage or closing. The stain that this means contact to go up won’t by burn-up, also won’t build up, can increase osculatory resistance thereby. Contact surface is aureate and applicable apply at this kind, its are rated osculatory resistor is 40 M Ω or smaller.

Switch dimension is 0.402 In. (10.2 Mm) grows X 0.257 In. (6.54 Mm) wide X 0.197 In. (5 Mm) is tall. Contact brings crural span to also accord with common 0.100 In. (2.54 Mm) PC board pitch reseau.

The SS14MDP2 of NKK Switches is SP3T BBM switch. This switch has a communal contact and 3 output contact (graph 6) .

Graph 6: SP3T switch is a kind of coping is sent use switch, have 3 slip places, can output contact join with 3 respectively. (picture origin: NKK Switches)

Switch of this kind of SP3T has 3 slip places. In the graph 6 shown intermediate positions, terminal 3 with terminal 2 be linked together. In leftmost position, terminal 1 with communal terminal 3 be linked together, and be in most the position of right, terminal 3 with terminal 4 be linked together. Regard BBM as switch, when slide block is mobile, be opposite with current terminal first disconnect, establishing next link again next.

SS14MDP2 uses silver-gilt interface, can bear below 30 VDC voltage 100 MA electric current, osculatory resistor is 20 M Ω or smaller.

Switch dimension is 0.622 In. (15.8 Mm) grows X 0.157 In. (4 Mm) wide X 0.177 In. (4.5 Mm) is tall. The span that hits a needle also accords with common 0.100 In. (Reseau of span of board aperture of 2.54 Mm) PC.

The last example is the SS12SBP2 of NKK Switches, this is slip switch of a SPDT, what differ with other switch is, its terminal span is 2 Mm (0.079 In. ) metric aperture span. Outside dividing terminal span, its norms and physical dimension and SS12SDP2 are identical.

The rated machinery of the switch of all SS series of article discussion and electric operation life are 10, 000. The working temperature limits of this series is – 15 ° C comes 60 ° C, use insert type moulding terminal, can cut off aid welding flux, dissolvent and other and harmful impurity.

Last word

The SS series of NKK Switches is to exceed small-sized and slip switch, dimension is compact, suit high density to spend circuit board installation and pile. Its STC orgnaization has an action response of smooth, pawl is remarkable with osculatory stability advanced advantage.

Its STC orgnaization has an action response of smooth, pawl is remarkable with osculatory stability advanced advantage.. Author: Art Pini)

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