The SEM1401 is a single trip amplifier.
Type Two wire (4 to 20) mA, 50 mA max.
Protection Reverse connection protected
Loop Drop 5 V max.
Alarm HIGH or LOW level, switch selected, side entry
Contact Single relay changeover with N/O / N/C contacts available
Rating Resistive Load 2 A @ 250 VAC/125 VDC max. Power 150 W (Inductive Loads)
Indication Alarm LED on module front face
Set point (0 to 100) % multi turn potentiometer, access on module front face
(Repeatability ± 0.2 %)
Hysteresis (0.1 to 5) % Single turn trim pot on module front face
Delay 0.5 second fixed delay
Failure Mode On loss of signal:- HIGH level No alarm condition; LOW level alarm
condition (i.e. Alarm operates as if signal has fallen to -25 % or 0 mA)
Minimum Current 3.5 mA
Isolation 3000 VAC rms between contacts and input 1000 VAC rms between contacts
Ambient (0 to 50) ºC; (10 to 95) % RH non condensing
Connection Captive clamp screws
Cable Size 4 mm² solid/2.5 mm² stranded
Case Material Grey Polyamide
Case Flammability To UL94-V0 VDE 0304 PT3 level 111A
Dimensions (60 x 60 x 21) mm (67.5 mm above rail)
Mounting Snap on “Top Hat” (DIN EN 50022-35)
Max Vibration 12 G (10 to 55) Hz at double amplitude 2 mm
Shock Res. 12 G
Compliant With EN50081-1, EN50082-1
Weight 100 grams
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WARNING! Hazardous voltages may be present on the terminals - the equipment must
be installed by suitability qualified personnel and mounted in an enclosure
providing protection to at least IP20.
WARNING! If not installed and used in accordance with these instructions, protection
against hazards may be impaired.
IMPORTANT NOTE it may be preferred to set the user adjustment on the bench prior to
installation. Please read Section 3.0 before installation.
This trip must be housed within a suitable enclosure that will provide protection from the external
environment, to ensure that the stated temperature and humidity operating ranges are maintained. As
SEM1401 contains a high quality relay, care must be taken to ensure the trip is not subjected to strong
shock or vibration, as this may result in momentary opening of the relay contacts. The SEM1401 must not
be located near a strong magnetic field, such as a transformer, solenoid or electric motor.
The SEM1401 case is designed to snap fit onto a standard “Top Hat” DIN rail. To remove from DIN rail, apply
pressure at the bottom face of the back upwards towards the rail to release the spring clip and tip away
from the top. The trip may be mounted in any orientation and stacked side by side along the rail.
Connections to the trip are made via screw terminals, with wire protector plates provided inside each
terminal. To maintain CE compliance twisted pair (screened) cables are recommended for signal connections.
It is also good practice to ensure that all (4 to 20) mA loops are grounded at a single point. Before
installation ensure the (4 to 20) mA loop has enough voltage available to drive the trip. Refer to the above
specification for the loop voltage drop. The change over contacts provided by the SEM1401 are capable of
switching 250 VAC 125 VDC @ 2 A resistive load, 150 W inductive load. Internal Varistors are connected
across the contacts to protect against over voltage. It is advised that a external R/C snubber network is
used when switching inductive AC loads (see Figure 1). When switching DC inductive loads, a diode
connected in parallel with the inductor must be used to protect the contacts from the energy stored in
the inductor (See Figure 2).
Installation overvoltage Category 2 (as per BS EN61010-1)
If this equipment is to be used in environments with overvoltage Category 3, transient suppressors
should be installed on wiring carrying greater than 50 VAC or 75 VDC.
Any power supply to the equipment greater than 50 VAC or 75 VDC must be protected by a suitable
fuse and a switch or circuit breaker which should be near the equipment.
The equipment contains no user serviceable parts.
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1.0 DESCRIPTION 3.0 INSTALLATION
2.0 SPECIFICATIONS
2.1 INPUT
2.2 OUTPUT
2.3 GENERAL SPECIFICATION
3.1 MECHANICAL
3.2 ELECTRICAL
