MTL Instruments MTL2210B Data sheet

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Oct 2004

To earth or
MTL4220

MTL2210B SWITCH
OPERATED RELAY

1-channel

Link

Motor
control
circuits

Load, alarm
or shutdown
circuits

Link for
latching

Stop
(unlatch)

Start
(latch
)

MTL4220

Link

All contacts shown in alarm condition (relay de-energised)

L

N

The MTL2210B enables two 500VA safe-area loads to be controlled
in separate circuits simultaneously by one light-duty on/off switch in a
hazardous area. Alternatively, it can be arranged to latch for
pushbutton stop/start control of an electric motor, the relay then being
energised by brief closure of one switch contact and de-energised by
the brief opening of another. The stop switch overrides the start switch,
even if the start circuit is closed, making sure that the motor can be
turned off under all conditions. In this application, the second pair of
changeover output contacts enables the status of the motor to be fed
to a computer or data logger.

SPECIFICATION

See also ‘Common specification’

Number of channels

One, fully floating

Location of switch(es)

Zone 0, IIC, T6 hazardous area
Div 1, Group A, hazardous location

Voltage applied to switch(es)

5.6V dc from 1.5kΩ

Input/output characteristics

Relay energised if <200Ω between tmnls 1 & 2 and 3 & 4
Relay de-energised if >500Ω between tmnls 1 & 2* or 3 & 4
Hysteresis, nominal 100Ω

*Non-latching mode

Latching facility

(Enabled by linking terminals 5 & 6)
Relay then latches ON when energised (shorts tmnls 1 & 2)
Relay de-energised if unlatch circuit broken (latching)

Power supply failure protection

Relay de-energised if supply fails

Broken line protection

Relay de-energised if either line broken (non-latching)
Relay de-energised if unlatch circuit broken (latching)

‘Fail-safe’ earth fault protection

(Enabled by connecting terminal 8 to earth)
Relay de-energised if <1kΩ to earth, total for all 3 lines
Relay not de-energised if >7.5kΩ to earth, total for all 3 lines

‘No-fail’ earth fault protection

(Enabled by connecting terminal 8 to MTL4220)
Fault on any line proclaimed: unit continues working

Response time

50ms, nominal

Contacts

2-pole changeover

Contact rating

250V:5A:500VA (ac) (resistive loads, reactive loads must be
suppressed)
250V:5A:250W (dc) (resistive loads, reactive loads must be
suppressed)

Contact life expectancy

2 x 105operations at maximum load

LED indicator

ON when relay energised

Consumption

0.9 to 1.4W (ac versions)
60mA (24V dc version)

Load, alarm
or shutdown
circuits

Motor stop/start control

Fail-safe protection

No-fail protection

L

N

L

N

Ambient temperature limits

–20 to +55°C (all versions, close packed)

–20 to +60°C (all versions, at least 5mm apart)

–40 to +80°C (all versions, storage)

Safety description

7V, 300Ω, 22mA

FM max entity parameters

Voc= 8.3V, Isc= 26mA, Ca= 7µF, La= 47mH

Hazardous area

Safe area

1
2

+

3
4
5
6
7
8

1
2

+

3
4
5
6
7
8

1
2

+

3
4
5
6
7
8

9
10
11
12
13
14
15
16

9
10

11
12
13
14
15
16

9

10

11
12
13
14
15
16

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