MTL Instruments MA15 Operating Manual

WARNING:

IMPORTANT SAFETY INFORMATION

To avoid risk of shock or fi re, which can be caused by incorrect wiring or
regulation, whenever installing mains surge protection devices, the safety
procedures must be followed.

Suitably qualifi ed personnel should carry out all installation.

1. Always isolate supply before installing or removing any connections.

2. The maximum rating of fuse/circuit breakers must not exceed the lower of:
a. The maximum value specifi ed for the surge protection device.
b. The power supply short circuit current.
c. The maximum rating of equipment protected by the surge protection
device.

INSTALLATION

Examples: For an in-line surge protection device with maximum specifi ed
through or line current of 15A,

a. Connected to a 30A power supply - Protect with 15A maximum.
b. Connected to a 8.5A UPS or standby generator - Protect at 5A

(A, 1.7 is the usual safety margin of fuses).

c. Connected to equipment rated at 5A maximum - Protect at 5A maximum.

• Correct polarity of live, neutral and earth (L,N,E) is essential. Check
both at SPD and source of supply.

• The supply voltage must be less than the maximum working voltage of
the SPD. Pay particular attention to UPS and standby generator regula­ tion and neutral earth bond.

NOTE: Ensure that surge protection devices are removed before performing
insulation or fl ash tests on equipment.

MAINTENANCE

The lifetime of the MA15 is dependent on the number of surges experienced;
however, the unit will typically provide maintenance-free protection over a
twenty year period.

In the event of a surge exceeding the device ratings, the unit is designed to
fail-safe, due to the secondary protection elements. The equipment, therefore,
remains protected.

INSTRUCTIONS/

USER MANUAL

MA15 DIN RAIL RFI &

SURGE PROTECTION

DEVICES

NOTE: The MA15 is designed to limit the voltage that can occur both
line-line and line-earth. Any system insulation test should be
carried out with the MA15 disconnected from the circuit.

801602 Rev A 1-22-02

For more information contact your local MTL rep:

www.mtlsurgetechnologies/support/distribution/index.htm

CONGRATULATIONS! YOU HAVE JUST PURCHASED THE BEST
SURGE PROTECTION IN THE INDUSTRY!

Adhering to these instructions guarantees maximum performance of this Pro­tection device.

The MA15 DIN RAIL RFI & SURGE PROTECTION DEVICES (SPDs)
are a range of DIN Rail mounting SPDs for mains power applications.

CONSTRUCTION

The casing of the MA15 has screw-clamp terminals for input and output con­nections. The maximum allowable wire cross section for the terminals is #10
AWG (2.5mm

CONNECTION

The MA15 may be installed in series with the load or, if the load current
exceeds 15A, it may be installed in parallel.

2)

INTRODUCTION

The MA15 protects electronic equipment from surges and Radio Frequency
Interference (RFI) on the mains power supply . The MA15 has a unique 3-stage
combination of protection elements providing fi ltering, surge protection and
ring suppression.

INSTALLATION

The MA15 simply clips on to “G”(EN0035 DIN46277-1) or “Top Hat”
(EN50022, DIN46277-2) DIN rail.

For “G” rails:

Clip on like this Clip off like this Not like this

Series Connection:

Connect the incoming mains (LNG) to the “UNPROTECTED” side of the
MA15 device, as indicated on the product labeling. The protected equipment
is connected to the “PROTECTED” side.

Parallel Connection:

Connect the incoming mains supply or equipment power (LNG) to the
“UNPROTECTED” side of the MA15 device, as indicated on the product
labeling. This will install the SPD in parallel with the supply and it will not
be subjected to any load current. Install 15A overcurrent protection (fuse or
circuit breaker) in the LINE wire.

The Live wire must be connected to the “L” terminal and the Neutral wire
must be connected to the “N” terminal of the MA15. If two core cable with­out an integral earth wire is being used, then for full protection, the earth “E”
terminal should be bonded to a suitable system earth point.

NOTE: A fuse or circuit breaker must be inserted in the mains input side of
the incoming supply. Rating will be according to the required load
current and apply to Series connection only.

For “Top Hat” rails:

Clip on like this Clip off like this Not like this

WARNINGS

1. This device is suitable for use in Class I, Division 2 Groups
A, B, C and D or non-hazardous locations ONLY.

2. EXPLOSION HAZARD - Substitution of components may
impair suitability for Class I, Division 2.

3. EXPLOSION HAZARD - DO NOT disconnect equipment
unless power has been switched off or the area is known to
be non-hazardous.