The DDS1531 energy meters are DIN rail single phase two wire active electronic energy meters. The energy meters adopt many advanced technologies of research and development, like microelectronic-techniques, specialized large-scale IC (integrated circuit), digital sampling and processing technology, SMT technique, and so on. DDS1531 energy meters technical performances completely conform to International Standards IEC 62053-21 for Class 1 single phase active energy meter. DDS1531 energy meters can directly and accurately measure the load active energy consumption in the single phase AC networks of rated frequency 50Hz or 60Hz. DDS1531 energy meters series have multiple types for option, to be suitable with the various market demands. DDS1531 energy meters have features with excellent long-term reliability, small volume, light weight, perfect appearance, easy installation, etc.

√ Available as 35mm DIN standard rail mounted, conforming to Standards DIN EN 50022, as well as front PANEL mounted (the center distance between two mounting holes is 63mm or 67mm). Two mounted methods above are optional for user.

√ 6 pole width (modulus 12.5mm), complying with Standards JB/T7121-1993.

√ Can select the step motor impulse register of 5+1 digits (99999.1kWh) or 6+1 digits (999999.1kWh) LCD display.

√ Can select two LCD displays with 6 digits, to show total power (5+1 digits display), and real-time power (4+2 digits display) which can be cleared by the red button on the nameplate. This red button can be protected by the seal and this model meter suits for the renting house.

√ Can select the inside load switch for the remote control credit.

√ Can select the inside far infrared data communication port and RS485 data communication port, the communication protocol complies with Standards DL/T645-1997, can also select the other communication protocol.

√ Equipped with a polarity passive energy impulse output terminal, conforming to Standards IEC 62053-31 and DIN 43864.

√ Two LEDs to indicate separately the power state (green) and the energy impulse signal (red).

√ Measure the active energy consumption in one direction on single phase two wire, which is not related with the load current flow direction at all, complying with Standards IEC 62053-21.

√ Direct connection for use. Two connections: type S and type T for option.

√ The short terminal cover is made with the transparent PC, to reduce the installation space and is convenient for centralized installation.

(Picture 1)

Wiring diagram -1 (Type S)
(Inlet wire from bottom, outlet wire on top)	Terminals	Note
	L	Phase line
	N	Neutral line
	2 and 3	Passive energy impulse output port

Wiring diagram -2 (Type T)
(Inlet wire from bottom, outlet wire on top)	Terminals	Note
	L1	Phase line
	L2/N	Neutral line
	2 and 3	Passive energy impulse output port
	T-connection: while connection, no need to cut the cable , please let the cable go straight through connection hole.

Wiring diagram -3 (Type S)
(Inlet wire from bottom, outlet wire on top)	Terminals	Note
	L	Phase line
	N	Neutral line
	3 and 4	Passive energy impulse output port
	1 and 2	RS485 communication port