Klockner Moeller Electric Parts from KlocknerMoeller.net
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1-877-595-9616
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Representing
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Contactors and Relays
Contactor relays
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| Suppressor circuits |
Electronic equipment is nowadays being increasingly used in combination with conventional switching devices such as
contactors. This equipment includes programmable logic controllers (PLCs) timing relays and coupling modules, whose operation can be adversely
affected by disturbances from interactions between all the components.
One of the disturbance factors occurs when inductive loads, such as coils of electromagnetic switching devices, are switched off. High
cut-off induction voltages can be produced when such devices are switched off and, under some circumstances, can destroy adjacent
electronic devices or, via capacitive coupling mechanisms, can generate interference voltage pulses and thus cause disruptions in operation.
Since interference-free disconnection is impossible without an accessory, the coils may be connected to a suppressor module, depending
on the application. The advantages and disadvantages of the various
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| Circuit diagram |
Load current and voltage responses |
Proof against incorrect connection also for
AC |
Additional dropout delay |
Induction voltage limiting defined |
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Very Long |
1 V |
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Medium |
UZD |
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Yes |
Short |
UZD |
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Yes |
Short |
-- |
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| Circuit diagram |
Damping also below ULIMIT
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Increased rating with circuitry. |
Remarks |
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Advantages: |
Dimensioning uncritical. Minimum possible induction voltage,
Very simple and reliable. |
| Disadvantage |
Long drop-out delay |
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Advantages: |
Very short drop-out delay. Dimensioning uncritical. Simple
construction |
| Disadvantage |
No damping below UZD |
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Advantages: |
Dimensioning uncritical. High energy absorption. Very simple
construction |
| Disadvantage |
No damping below UZD |
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Yes |
Yes |
Advantages: |
HF damping due to stored energy. Immediate de-energisation.
Highly suitable for AC. |
| Disadvantage |
Precise dimensioning required |
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