Delta MCS-1800 Specifications download pdf (Page 60)

NEW!

POWER MONITORING & PROTECTION

970

NEW!

POWER MONITORING & PROTECTION

WHEN YOU NEED IT RIGHT, RIGHT NOW, CALL KELE.

kele.com888-397-5353 USA

ORDERING INFORMATION

METAL OXIDE VARISTOR, TRANSZORB

V130LA1, V39ZA1, V47ZA1, 1.5KE56CA

DESCRIPTION

Metal Oxide Varistor (MOV) and Transzorb Voltage

Transient Suppressors reduce high voltage spikes that

could damage or confuse sensitive electronic circuits. Voltage

spikes often will cause digital logic circuits to select an

incorrect logic state or lock up entirely.

Power Transformer

120 VAC

24 VAC

120V

MOV

24V

MOV

Suppresses external voltage spikes coming from

the power distribution bus and the spikes from

switching the power transformer off.

Circuit Hot

Circuit Return

MOV

(both places)

Reduces mechanical switch arcs and electronic

switch over-voltage breakdown. MOV voltage

should match load circuit voltage.

Inductive Load

(relay, EP valve, etc.)

Load Switch

(mechanical or electrical)

Transformer Installation

Coil and Switch Installation

WIRING

V130LA1

CAUSES OF VOLTAGE SPIKES

Voltage spikes appear in the user's circuit in three main ways:

1. Voltage spikes come in on the power distribution bus and

are coupled to the user's circuits by the winding-to-winding

capacitance of the user's power transformers.

2. Voltage spikes are generated in the power transformer

secondary when the power transformer primary is turned

off and the transformer's magnetic ﬁeld collapses.

3. Voltage spikes are generated within the user's circuits

when an inductive load is switched off and the load's

magnetic ﬁeld collapses. Voltage noise is also generated at

the switched contacts and is radiated to the wires leading

to the user's microprocessor.

OPERATION

When a voltage at or below the suppressor's nominal

voltage is applied, the suppressor acts essentially like an

open circuit. When a high-voltage spike appears across the

suppressor the suppressor conducts or turns on, shunting

the excess energy to the circuit return path, thereby reducing

the amplitude of the voltage spike. When the voltage spike

subsides, the suppressor reverts back to its open circuit state.

MOV suppressors are bi-directional and can be used to

protect both AC and DC circuits. They provide a somewhat

soft clamping action in that the amplitude of the reduced

voltage spike rises noticeably with the amount of energy

contained in the spike. Transzorb suppressors come in

unidirectional and bi-directional versions. The uni-directional

versions are polarity-sensitive and can only be used in DC

applications. The bi-directional versions may be used in both

AC and DC circuits just like the MOV. Transzorbs have a

faster response time and a much harder clamping action

than MOVs because voltage spikes are clipped at a more

consistent level independent of their energy content. The

Transzorb sold by Kele is a bi-directional version.

Note: Kele carries the varistors and transzorbs most often

speciﬁed by the BAS manufacturers. They are general-

purpose in nature and should cover most applications at the

recommended voltage.

MODEL DESCRIPTION

V130LA1 130 VAC/175 VDC varistor voltage transient suppressor

V39ZA1 25 VAC/31 VDC varistor voltage transient suppressor

V47ZA1 30 VAC/38 VDC varistor voltage transient suppressor

1.5KE56CA 24 VAC/VDC transzorb voltage transient suppressor

V39ZA1

V47ZA1

1.5KE56CA

V130LA UL-recognized component,

File #E75961 and E56529

V39ZA1/V47ZA1 UL-recognized component,

File #E135010

1.5KE56CA UL-recognized component,

File #E116110

AGENCY APPROVALS

March 2014

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Delta MCS-1800 Specifications Page 60

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