Jokab Safety BT50, BT50T Catalog Page

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Safety relay/expansion relay

BT50(T)

Approvals:

TÜV Nord

Safety relay for:

Emergency stop

Interlocked hatch

Expansion of Pluto

Features:

Single and “dual” channel

Test/"reset" input

Width 22.5 mm

LED indication

Safety relay/expansion relay to Pluto

The BT50 is designed to connect safety devices, such as
emergency stops, directly in the voltage supply circuit to
the relay. Despite a maximum built-in width of 22.5 mm the
relay is very powerful.
With 3NO safety outputs, 1NC output (for monitoring
purposes), a test input and complete internal supervision,
the BT50 is quite unique. In addition, delayed outputs
(BT50T) can be ordered.
In order for the safety outputs to close, the supply volt­age, e.g. by means of an emergency stop button, must be
connected to A1 and A2 and the test input closed. After
actuation of the relay the test input can be opened again.
The test input is intended to supervise that contactors
or valves have dropped/returned before a new start can
be permitted.The test input can also be used for starting
and the start button can be supervised (see the connec­tion example on the next page).

More outputs

By connecting a BT50 to a safety relay/PLC it is easy to
increase the number of safe outputs. This means that an
unlimited number of dangerous machine operations and
functions can be stopped by using just one safety-PLC.

Safety level

BT50 have an internal redundant and monitored safety
function. Power failure, internal component faults or exter­nal interference cannot result in dangerous functions.
Input via A1 on its own is not protected from short

3 NO/1NC relay outputs

Supply 24 VDC

Quick release connector
blocks

BT50 - Additional power
terminals

BT50T - One changeover
relay with a double informa­tion output (Y14)

BT50T - Delay times selec­table from 0 - 1.5 s

circuiting, and therefore installation is critical for the safe­ty level to be achieved. To achieve a higher safety level a
screened cable can be used and/or connection made to
both A1 and A2 (see the example on the next page).

Regulations and standards

The BT50 is designed and approved in accordance with
appropriate directives and standards. See technical data.

Connection examples

For examples of how our safety relays can solve various
safety problems, please see the chapter “Connection
examples”.

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Technical data – BT50(T)

1 2 0

84

2 2 , 5

Manufacturer ABB AB/Jokab Safety, Sweden
Article number/Ordering data

BT50 2TLJ010033R0000
BT50T 2TLJ010033R1000

Colour Black and beige
Operational voltage 24 VDC + 15%/-25%
Power consumption 1,4 W/1,8 W
Relay Outputs 3 NO + 1 NC
Max. switching capacity

Resistive load AC 6A/250 VAC/1500 VA
Inductive load AC AC15 240VAC 2A
Resistive load DC 6A/24 VDC /15 0 W
Inductive load DC DC13 24VDC 1A

Max. res. load total switching
capacity: 12A distributed on all contacts

Min. load 10mA /10 V(if load on contact has

Contact material Ag + Au flash
Fuses Output (External) 5A gL/gG
Conditional short-circuit current

(1 kA) 6A gG
Max Input Wire res. at nom.

voltage 200 Ohms
Response time at deactivation

(input - output)

not exceeded 100 mA)

Version B <20 ms or delayed ma x
1500 ms (old version of BT50
<60 ms)

Terminals (Max. screw torque 1 Nm)

Single strand: 2x1.5 mm
Conductor with socket contact: 2x1mm2.

Mounting 35 mm DIN-rail
Protection class enclosure/

terminals IP 40/20 IEC 60529
Impulse Withstand Voltage 2.5kV
Pollution Degree 2
Operating temperature range -10°C to +55°C (with no icing or

Operating humidity range 35% to 85%
LED indication Electrical Supply, Relay and X4
Weight 200 g
Performance (max.)

Functional test: The relays must be
cycled at least once a year.

Conformity 2006/42/ EC, 2006/95/EC,

condensation)

Category 4/PL e (EN ISO 13849­1:2 008)
SIL 3 (EN 62061:2005)
PFHd 1.22E-08

2004 /10 8/EC
EN 954-1:1996, EN 62061:2005
EN ISO 13849-1:2008

Connector blocks are detachable
(without cables having to be
disconnected)

2

1

2

3

4

5

Technical description – BT50(T)

Supervision circuit

When supply voltage is connected to A1
and A2, relays K1 and K2 are activated. K1
and K2 drop if the supply voltage is discon­nected. Both relays K1 and K2 must drop for
them to be activated again. Another require­ment is that the test circuit, A1 - X4, must
be closed for the outputs to be activated.
Thereafter A1 - X4 can either be open or
constantly closed.

The supervising circuit ensures that both
K1 and K2 have dropped before they can
be reactivated. The stop function complies
with the requirement that a component fault

Electrical connection – BT50(T)

K1

K2

or external interference cannot lead to a
dangerous function.

The safety outputs consist of contacts
from K1 and K2 connected internally in
series across terminals 13 - 14, 23 - 24,
and 33 - 34. These contacts are used to
cut the power to components which stop
or prevent hazardous movements/functions.
It is recommended that all switched loads
are adequately suppressed and/or fused in
order to provide additional protection for the
safety contacts.

The NC output 41 - 42 should only be
used for monitoring purposes e.g. indication
lamp for emergency stop pressed.

BT50T - Info. output

Max load
250 mA

BT50T - Delay times

A2 T1 T2 A2 T1 T2

0 s

0.5 s

1.0 s

1.5 s

6

7

8

9

10

*

Emergency stop with reset when emergency
button returns.

*

Emergency stop with dual connection direct
to the supply voltage.

* BT50 has additional power terminals A1 and A2.

*

Hatch with automatic reset. BT50 as emergency stop and control

relay with Start and Stop function.

A1 X4

Controlled monitoring of external contac­tor, relay, valve or ABB Jokab Safety’s
expansion relays.

Monitoring to ensure that the On but-

A1 X4

ton is not stuck in pressed position. A
short circuit over the closing contact is
not monitored.

LOAD

11

12

13

14