• Reverse Power Protection
• Perfectly linear trip level
• Insulated measurements
• Digital delay circuit
• Latching trip relay
• 50 hour burn-in before test
• Certified for marine use

The T2000 Reverse Power Relay will protect the generator from being run as an electric motor. The T2000 will protect the prime mover of the generator against physical damage, but will also protect the parallel running generators from overload caused by the inversed load shift in a reverse power situation.

• Protects against excitation loss
• Insulated measurements
• Digital delay circuit
• Latching trip relay
• 50 hour burn-in before test

The T2100 Excitation Loss Relay protects against partial or complete excitation loss (field loss) on the synchronous generator. If the generator under parallel operation has a low excitation, a high inductive current is running into the generator. This current is detected and the breaker of the faulty generator is tripped, thus avoiding overload on the other generators with a possible black-out of the system.

• Protection of generators against overcurrent
• Visual indication of power, pick-up and relay tripping
• High precision digital countdown timer for delayed output
• Accepts high supply voltage variations: 60 - 110%

The SELCO T2200 has a broad application where all 3 phases or any single phase current detection will function for protection, control or monitoring. The relay detects the highest of the 3 input currents and, on exceeding the preset value, an output relay will be activated after a preset time delay.

Available in many versions, varying in supply voltage, measuring currents, and functions.

• Protection of generators against short circuit
• Visual indication of power, pick-up and relay tripping
• High precision digital countdown timer for delayed output

The SELCO T2300 is intended for protection of generators, power transmissions and consumers against damage caused through short circuit by tripping the circuit breaker. The relay detects the highest of the 3 input currents and on exceeding the preset values, an output relay will be activated after a preset time delay or momentarily (0.1 second).

• Protection of generators against overcurrent
• Trip of non essential services at peak loads
• Price competitive, due to the combined features
• Visual indication of power, pick-up and relay tripping on both relays

The SELCO T2400 consists of two combined over current relays, intended for protection, or monitoring of generators, power transmissions and consumer supply.

A typical application for protection of a generator is for one of the over current functions to trip the generator breaker and the other over current function to trip a nonessential service. Both over current functions could be used to trip 2 levels of nonessential load. The relay detects the highest of the 3 input currents and, on exceeding the preset values, output relays will be activated after preset time delays.

• Over-Current Protection
• Short-Circuit Protection
• Perfectly linear trip level
• Insulated measurements
• Digital delay circuit
• 50 hour burn-in before test
• Certified for marine use

The SELCO T2500 is a high quality Over-Current and Short-Circuit relay intended for protection against thermal damage and faults caused by excessive currents.

The T2500 can be used to protect generators, power transmission lines and various types of consumer supplies. The T2500 monitors two levels of current and trips the circuit breaker when one of these two levels has been exceeded continuously for a time period (defined by an adjustable delay).

• Price competitive due to the combined functions
• Possibility of more than three generators with Extension Unit T2600-50
• Visual indication of power, pick-up and relay tripping on both relays
• High precision digital countdown timer for delayed output

The SELCO T2600 determines load depending start and stop level of the diesel generator. When load increases on the running diesel generators more than e.g. 90% adjustable, for a preset time, a start signal to call for the standby diesel generator will be provided. If the load decreases more than e.g. 45% adjustable, for a preset time, a stop signal will be provided to dismiss one of the diesel generators.

The SELCO T2600 can serve an installation with up to three diesel generators. The number of diesel generators can be extended.

• Overload Protection
• Perfectly linear trip level
• Insulated measurements
• Digital delay circuit
• Latching trip relay
• 50 hour burn-in before test
• Certified for marine use

The T2700 Overload Relay will protect the generator from excessive active load. The T2700 is necessary to protect the prime mover and alternator against physical damage.

• Protection of generators against earth faults or overcurrent
• Visual indication of power, pick-up and relay tripping
• Wide range of settings for current and delay, both in two steps
• High precision digital countdown timer for delayed output

The SELCO T2800 has a broad application as an earth fault - or single phase over current detection relay, it has a wide setting range for protection, control or monitoring. The relay detects the magnitude of the current and, on exceeding the preset value, an output relay will be activated after a preset time delay.

Available in many versions, varying in supply voltage, measuring currents, and functions.

• Protection of generators against differential currents
• Visual indication of power, pick-up and relay tripping
• High precision digital countdown timer for delayed output
• Normal function upon loss of supply due to built-in energy source

• Price competitive due to combined functions
• Visual indication of power, pick-up and relay tripping on both relays
• High prection digital countdown timer for delayed output
• Accepts high supply voltage variations: 70-110%

The SELCO T3000 is intended for effective frequency surveillance on generators, busbar or other distribution systems. The relay contains the functions "under frequency" and "over frequency" time delayed, and 2 individual output relays, one relay for each function.

• Price competitive due to combined functions
• Visual indication of power, pick-up and relay tripping on both relays
• High prection digital countdown timer for delayed output
• Accepts high supply voltage variations: 70-110%

The SELCO T3100 is intended for effective voltage surveillance on generators, busbar or other distribution systems. The relay contains the functions "under voltage" and "over voltage" time delayed, and 2 individual output relays, one relay for each function.

• Price competitive due to combined functions • Visual indication of power, pick-up and relay tripping on both relays • High precision digital countdown timer for delayed output • Cost effective and highly reliable compact design

The SELCO T3200 is intended for continuous insulation monitoring on three phase insulated networks on board ships. The relay monitors continuously two systems galvanically separated from each other, e.g. the busbar and the lighting system, or two busbar systems.

The unit features two output relays for alarm purposes and two analogue outputs for instrument reading. The instrument is not included with the relay. Instruments are available from SELCO as standard sized switchboard component.

• 3 phase measurements
• Separate supply circuit
• Over voltage
• Under voltage
• Hysteresis

The SELCO T3300 is intended for three phase effective voltage surveillance on generators, busbar or other distribution systems. The relay contains the functions "under voltage" and "over voltage" time delayed, and 2 individual output relays, one relay for each function.

The T3300 includes a total of four internal transformers. Three of these transformers are used for measurement and one dedicated to supplying the internal electronics. The internal transformers provide optimal isolation and the best possible accuracy. The use of a dedicated transformer for supply prevents load disturbance to any of the three measurements.

• Acts on df/dt
• Programmable delay
• External blocking
• Loss of mains application
• Marine approved

The SELCO T3500 Frequency Deviation Relay will, based on a simple AC voltage measurement, monitor the change in frequency over a time period of one second.

The T3500 Pick up LED will ignite as soon as the voltage frequency has changed more than 0.5 Hz to 1.5 Hz per second, while the internal relay (and the relay indication LED) activates after the frequency deviation has existed for more than 100 milliseconds.

The 100 millisecond delay can be omitted by bridging two external connection terminals. An alternative delay of 50 milliseconds can be obtained by inserting a resistor between the two terminals. The Pick Up and Relay LED will ignite simultaneously if the delay is omitted.

• Automatic synchronisation
• Voltage based speed control
• Frequency and phase lock
• 50 hour burn-in before test

The SELCO T4000 Auto-Synchroniser provides automatic synchronisation and connection of a generator to a live bus bar.

The T4000 measures the voltage across two phases on either side of the circuit breaker in order to obtain data on frequency, phase and voltage deviation.

• Active load sharing
• Frequency control
• Voltage based speed control
• Reverse power protection
• Soft load/unload with breaker trip
• 50 hour burn-in before test

The SELCO T4400 Load Sharer is designed to control a generator operating in parallel with the grid, or a generator operating in parallel with other generators (which are also controlled by T4400 units).

The T4400 will basically perform the same task as the T4300 Load Sharer; however the T4400 includes built-in frequency control and an optimized regulation scheme. These two features provide near perfect stability and compensates for any drift within the speed controller. A soft load/unload facility is also included.

• Automatic synchronisation
• Automatic voltage matching
• Relay based speed control
• Adjustable breaker make time
• 50 hour burn-in before test
• Certified for marine use

The SELCO T4500 Auto-Synchroniser provides automatic synchronisation and connection of a generator to a live bus bar.

The T4500 measures the voltage across two phases on either side of the circuit breaker in order to obtain data on frequency, phase and voltage deviation.

• Active load sharing
• System frequency control
• Relay based speed control
• Reverse power protection
• Soft unload with breaker trip
• 50 hour burn-in before test
• Certified for marine use

The SELCO T4800 Load Sharer is designed to control a generator operating in parallel with the grid, or a generator operating in parallel with other generators (which are also controlled by T4800 units).

• Reactive load sharing
• System voltage control
• Relay based voltage control
• Soft unload with breaker trip
• 50 hour burn-in before test
• Certified for marine use

The SELCO T4900 VAr-Load Sharer is designed to control a generator operating in parallel with the grid, or a generator operating in parallel with other generators (which are also controlled by T4900 units).

• Manual synchronisation
• Adjustable voltage difference
• 50 hour burn-in before test
• Certified for marine use

The T5000 Paralleling Relay is in fact a check synchroniser.

The T5000 has two separately insulated voltage inputs, one for each system.

A built-in relay will close when voltage, frequency and phase are within safe limits. The relay output can be connected in series with a manual contact to operate the circuit breaker between the two systems.

• Programmable incr/decr ramps
• VDC, mA or PWM output
• Variable output range
• Isolated output
• Power ref. feature
• 6 prog. power settings
• PC programmable

The T7900 Electronic Potentiometer is typically used as an interface between a unit that provides increase/decrease contacts signals and electronic speed governors or voltage regulators (AVR) controlled by analogue voltage or current signals.

The T7900 works much like a conventional motorized potentiometer (e.g. the SELCO E7800); however, instead of a variable resistance, the T7900 provides a variable voltage (e.g. -5 to +5 VDC), current (e.g. 4-20 mA) or a pulse width modulated signal (PWM). The voltage and current range is programmable. The PWM output provides a 500 Hz signal with programmable duty cycle. The analogue outputs are galvanically isolated.

• Enables fast clearing of a blackout
• Monitoring 4 generators in 1 unit, and 8 generators in 2 units
• Communication with another Blackout Limiter over only 1 wire
• Flame retardant enclosure
• DIN rail or screw mounting

The SELCO Blackout Limiter T8400 enables fast clearing of a blackout. If a blackout occurs, the first generator to have more than 90 % voltage will make the generator breaker close. It is possible to monitor up to 4 generators with 1 unit and up to 8 generators with 2 units.